763891732081 has 3 divisors (see below), whose sum is σ = 763892606091. Its totient is φ = 763890858072.

The previous prime is 763891732033. The next prime is 763891732103. The reversal of 763891732081 is 180237198367.

It is a happy number.

The square root of 763891732081 is 874009.

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., 556502572081 + 207389160000 = 745991^2 + 455400^2 .

It is not a de Polignac number, because 763891732081 - 2²³ = 763883343473 is a prime.

It is a super-2 number, since 2×763891732081² (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 (763891732181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 437005 + ... + 1311013.

It is an arithmetic number, because the mean of its divisors is an integer number (254630868697).

Almost surely, 2^763891732081 is an apocalyptic number.

763891732081 is the 874009-th square number.

763891732081 is the 437005-th centered octagonal number.

It is an amenable number.

763891732081 is a deficient number, since it is larger than the sum of its proper divisors (874010).

763891732081 is an frugal number, since it uses more digits than its factorization.

763891732081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748018 (or 874009 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 763891732081 in words is "seven hundred sixty-three billion, eight hundred ninety-one million, seven hundred thirty-two thousand, eighty-one".