7977709798656 has 864 divisors, whose sum is σ = 24351180198912. Its totient is φ = 2314575544320.

The previous prime is 7977709798571. The next prime is 7977709798727. The reversal of 7977709798656 is 6568979077797.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 46113929386 + ... + 46113929558.

Almost surely, 2^{7977709798656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7977709798656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12175590099456).

7977709798656 is an abundant number, since it is smaller than the sum of its proper divisors (16373470400256).

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

7977709798656 is a wasteful number, since it uses less digits than its factorization.

7977709798656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 17643316320, while the sum is 87.

The spelling of 7977709798656 in words is "seven trillion, nine hundred seventy-seven billion, seven hundred nine million, seven hundred ninety-eight thousand, six hundred fifty-six".