617680557 has 24 divisors (see below), whose sum is σ = 1011410400. Its totient is φ = 360103968.

The previous prime is 617680537. The next prime is 617680561. The reversal of 617680557 is 755086716.

617680557 is a `hidden beast` number, since 6 + 17 + 6 + 80 + 557 = 666.

It is not a de Polignac number, because 617680557 - 2⁶ = 617680493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617680507) 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, 136707 + ... + 141152.

It is an arithmetic number, because the mean of its divisors is an integer number (42142100).

Almost surely, 2^617680557 is an apocalyptic number.

It is an amenable number.

617680557 is a deficient number, since it is larger than the sum of its proper divisors (393729843).

617680557 is a wasteful number, since it uses less digits than its factorization.

617680557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277897 (or 277894 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 617680557 is about 24853.1800178569. The cubic root of 617680557 is about 851.6372397686.

The spelling of 617680557 in words is "six hundred seventeen million, six hundred eighty thousand, five hundred fifty-seven".