766721212169 has 4 divisors (see below), whose sum is σ = 836423140560. Its totient is φ = 697019283780.

The previous prime is 766721212163. The next prime is 766721212219. The reversal of 766721212169 is 961212127667.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 766721212169 - 2²⁴ = 766704434953 is a prime.

It is a super-2 number, since 2×766721212169² (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 (766721212163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34850964179 + ... + 34850964200.

It is an arithmetic number, because the mean of its divisors is an integer number (209105785140).

Almost surely, 2^766721212169 is an apocalyptic number.

It is an amenable number.

766721212169 is a deficient number, since it is larger than the sum of its proper divisors (69701928391).

766721212169 is a wasteful number, since it uses less digits than its factorization.

766721212169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69701928390.

The product of its digits is 762048, while the sum is 50.

The spelling of 766721212169 in words is "seven hundred sixty-six billion, seven hundred twenty-one million, two hundred twelve thousand, one hundred sixty-nine".