772864477521 has 8 divisors (see below), whose sum is σ = 1030490102304. Its totient is φ = 515240918880.

The previous prime is 772864477493. The next prime is 772864477523. The reversal of 772864477521 is 125774468277.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 772864477521 - 2¹⁹ = 772863953233 is a prime.

It is a super-2 number, since 2×772864477521² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (772864477523) 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 7 ways as a sum of consecutive naturals, for example, 955885 + ... + 1568261.

It is an arithmetic number, because the mean of its divisors is an integer number (128811262788).

Almost surely, 2^772864477521 is an apocalyptic number.

It is an amenable number.

772864477521 is a deficient number, since it is larger than the sum of its proper divisors (257625624783).

772864477521 is a wasteful number, since it uses less digits than its factorization.

772864477521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033071.

The product of its digits is 36879360, while the sum is 60.

The spelling of 772864477521 in words is "seven hundred seventy-two billion, eight hundred sixty-four million, four hundred seventy-seven thousand, five hundred twenty-one".