77656470732340 has 12 divisors (see below), whose sum is σ = 163078588537956. Its totient is φ = 31062588292928.

The previous prime is 77656470732331. The next prime is 77656470732377. The reversal of 77656470732340 is 4323707465677.

It can be written as a sum of positive squares in 2 ways, for example, as 13900653376164 + 63755817356176 = 3728358^2 + 7984724^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1941411768289 + ... + 1941411768328.

It is an arithmetic number, because the mean of its divisors is an integer number (13589882378163).

Almost surely, 2^{77656470732340} is an apocalyptic number.

It is an amenable number.

77656470732340 is an abundant number, since it is smaller than the sum of its proper divisors (85422117805616).

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

77656470732340 is a wasteful number, since it uses less digits than its factorization.

77656470732340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882823536626 (or 3882823536624 counting only the distinct ones).

The product of its (nonzero) digits is 124467840, while the sum is 61.

The spelling of 77656470732340 in words is "seventy-seven trillion, six hundred fifty-six billion, four hundred seventy million, seven hundred thirty-two thousand, three hundred forty".