618997977 has 32 divisors (see below), whose sum is σ = 989206400. Its totient is φ = 380293056.

The previous prime is 618997961. The next prime is 618997991. The reversal of 618997977 is 779799816.

618997977 is a `hidden beast` number, since 618 + 9 + 9 + 7 + 9 + 7 + 7 = 666.

It is not a de Polignac number, because 618997977 - 2⁴ = 618997961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (618997277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300483 + ... + 302535.

It is an arithmetic number, because the mean of its divisors is an integer number (30912700).

Almost surely, 2^618997977 is an apocalyptic number.

It is an amenable number.

618997977 is a deficient number, since it is larger than the sum of its proper divisors (370208423).

618997977 is a wasteful number, since it uses less digits than its factorization.

618997977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2934 (or 2928 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The square root of 618997977 is about 24879.6699535987. The cubic root of 618997977 is about 852.2422813246.

The spelling of 618997977 in words is "six hundred eighteen million, nine hundred ninety-seven thousand, nine hundred seventy-seven".