771427985207656 has 48 divisors (see below), whose sum is σ = 1736855634925440. Its totient is φ = 319947090634080.

The previous prime is 771427985207647. The next prime is 771427985207717. The reversal of 771427985207656 is 656702589724177.

It is a super-2 number, since 2×771427985207656² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31740770650 + ... + 31740794953.

It is an arithmetic number, because the mean of its divisors is an integer number (36184492394280).

Almost surely, 2^{771427985207656} is an apocalyptic number.

It is an amenable number.

771427985207656 is an abundant number, since it is smaller than the sum of its proper divisors (965427649717784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

771427985207656 is a wasteful number, since it uses less digits than its factorization.

771427985207656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63481565654 (or 63481565643 counting only the distinct ones).

The product of its (nonzero) digits is 2489356800, while the sum is 76.

The spelling of 771427985207656 in words is "seven hundred seventy-one trillion, four hundred twenty-seven billion, nine hundred eighty-five million, two hundred seven thousand, six hundred fifty-six".