77917814557 has 8 divisors (see below), whose sum is σ = 86978026080. Its totient is φ = 69187065360.

The previous prime is 77917814549. The next prime is 77917814561. The reversal of 77917814557 is 75541871977.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77917814557 - 2³ = 77917814549 is a prime.

It is a super-2 number, since 2×77917814557² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77917814495 and 77917814504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77917814257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82365082 + ... + 82366027.

It is an arithmetic number, because the mean of its divisors is an integer number (10872253260).

Almost surely, 2^77917814557 is an apocalyptic number.

It is an amenable number.

77917814557 is a deficient number, since it is larger than the sum of its proper divisors (9060211523).

77917814557 is a wasteful number, since it uses less digits than its factorization.

77917814557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164731163.

The product of its digits is 17287200, while the sum is 61.

The spelling of 77917814557 in words is "seventy-seven billion, nine hundred seventeen million, eight hundred fourteen thousand, five hundred fifty-seven".