77256463725 has 54 divisors (see below), whose sum is σ = 160966755690. Its totient is φ = 35317235520.

The previous prime is 77256463717. The next prime is 77256463727. The reversal of 77256463725 is 52736465277.

It is a happy number.

77256463725 is a `hidden beast` number, since 7 + 7 + 2 + 564 + 6 + 3 + 72 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 23282487396 + 53973976329 = 152586^2 + 232323^2 .

It is not a de Polignac number, because 77256463725 - 2³ = 77256463717 is a prime.

It is a super-2 number, since 2×77256463725² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77256463727) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 3492670 + ... + 3514719.

Almost surely, 2^77256463725 is an apocalyptic number.

77256463725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77256463725 is an abundant number, since it is smaller than the sum of its proper divisors (83710291965).

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

77256463725 is a wasteful number, since it uses less digits than its factorization.

77256463725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007419 (or 7007404 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 54.

The spelling of 77256463725 in words is "seventy-seven billion, two hundred fifty-six million, four hundred sixty-three thousand, seven hundred twenty-five".