760664809921 has 3 divisors (see below), whose sum is σ = 760665682083. Its totient is φ = 760663937760.

The previous prime is 760664809909. The next prime is 760664809967. The reversal of 760664809921 is 129908466067.

It is a happy number.

The square root of 760664809921 is 872161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 208199651521 + 552465158400 = 456289^2 + 743280^2 .

It is not a de Polignac number, because 760664809921 - 2¹⁵ = 760664777153 is a prime.

It is a super-2 number, since 2×760664809921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (760664809321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 436081 + ... + 1308241.

It is an arithmetic number, because the mean of its divisors is an integer number (253555227361).

Almost surely, 2^760664809921 is an apocalyptic number.

760664809921 is the 872161-st square number.

760664809921 is the 436081-st centered octagonal number.

It is an amenable number.

760664809921 is a deficient number, since it is larger than the sum of its proper divisors (872162).

760664809921 is an frugal number, since it uses more digits than its factorization.

760664809921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744322 (or 872161 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 760664809921 in words is "seven hundred sixty billion, six hundred sixty-four million, eight hundred nine thousand, nine hundred twenty-one".