77506656425 has 96 divisors (see below), whose sum is σ = 111343766400. Its totient is φ = 52996608000.

The previous prime is 77506656407. The next prime is 77506656431. The reversal of 77506656425 is 52465660577.

It is a happy number.

It is not a de Polignac number, because 77506656425 - 2⁶ = 77506656361 is a prime.

It is a Curzon 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, 52052081 + ... + 52053569.

It is an arithmetic number, because the mean of its divisors is an integer number (1159830900).

Almost surely, 2^77506656425 is an apocalyptic number.

It is an amenable number.

77506656425 is a deficient number, since it is larger than the sum of its proper divisors (33837109975).

77506656425 is a wasteful number, since it uses less digits than its factorization.

77506656425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 53.

The spelling of 77506656425 in words is "seventy-seven billion, five hundred six million, six hundred fifty-six thousand, four hundred twenty-five".