77342494257 has 24 divisors (see below), whose sum is σ = 127830597440. Its totient is φ = 44142369120.

The previous prime is 77342494253. The next prime is 77342494283. The reversal of 77342494257 is 75249424377.

77342494257 is a `hidden beast` number, since 7 + 7 + 342 + 49 + 4 + 257 = 666.

It is not a de Polignac number, because 77342494257 - 2² = 77342494253 is a prime.

It is a super-2 number, since 2×77342494257² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77342494253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 688219 + ... + 792672.

Almost surely, 2^77342494257 is an apocalyptic number.

It is an amenable number.

77342494257 is a deficient number, since it is larger than the sum of its proper divisors (50488103183).

77342494257 is a wasteful number, since it uses less digits than its factorization.

77342494257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481733 (or 1481730 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 54.

The spelling of 77342494257 in words is "seventy-seven billion, three hundred forty-two million, four hundred ninety-four thousand, two hundred fifty-seven".