776811322568 has 36 divisors (see below), whose sum is σ = 1462618339665. Its totient is φ = 386786530528.

The previous prime is 776811322559. The next prime is 776811322589. The reversal of 776811322568 is 865223118677.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 566975868484 + 209835454084 = 752978^2 + 458078^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=623222.

It is a super-2 number, since 2×776811322568² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 790245005 + ... + 790245987.

Almost surely, 2^776811322568 is an apocalyptic number.

It is an amenable number.

776811322568 is a deficient number, since it is larger than the sum of its proper divisors (685807017097).

776811322568 is an frugal number, since it uses more digits than its factorization.

776811322568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606 (or 1302 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 56.

The spelling of 776811322568 in words is "seven hundred seventy-six billion, eight hundred eleven million, three hundred twenty-two thousand, five hundred sixty-eight".