618723957 has 4 divisors (see below), whose sum is σ = 824965280. Its totient is φ = 412482636.

The previous prime is 618723949. The next prime is 618723977. The reversal of 618723957 is 759327816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 618723957 - 2³ = 618723949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618723977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103120657 + ... + 103120662.

It is an arithmetic number, because the mean of its divisors is an integer number (206241320).

Almost surely, 2^618723957 is an apocalyptic number.

It is an amenable number.

618723957 is a deficient number, since it is larger than the sum of its proper divisors (206241323).

618723957 is a wasteful number, since it uses less digits than its factorization.

618723957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206241322.

The product of its digits is 635040, while the sum is 48.

The square root of 618723957 is about 24874.1624381606. The cubic root of 618723957 is about 852.1165049854.

The spelling of 618723957 in words is "six hundred eighteen million, seven hundred twenty-three thousand, nine hundred fifty-seven".