77531051025 has 18 divisors (see below), whose sum is σ = 138866727350. Its totient is φ = 41349893760.

The previous prime is 77531050999. The next prime is 77531051041. The reversal of 77531051025 is 52015013577.

It is a happy number.

77531051025 is a `hidden beast` number, since 77 + 53 + 1 + 0 + 510 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 24513225489 + 53017825536 = 156567^2 + 230256^2 .

It is not a de Polignac number, because 77531051025 - 2⁸ = 77531050769 is a prime.

It is a super-2 number, since 2×77531051025² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 172291000 + ... + 172291449.

Almost surely, 2^77531051025 is an apocalyptic number.

77531051025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77531051025 is a deficient number, since it is larger than the sum of its proper divisors (61335676325).

77531051025 is a wasteful number, since it uses less digits than its factorization.

77531051025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344582465 (or 344582457 counting only the distinct ones).

The product of its (nonzero) digits is 36750, while the sum is 36.

The spelling of 77531051025 in words is "seventy-seven billion, five hundred thirty-one million, fifty-one thousand, twenty-five".