18427979077 has 8 divisors (see below), whose sum is σ = 18538443000. Its totient is φ = 18317686464.

The previous prime is 18427979057. The next prime is 18427979099. The reversal of 18427979077 is 77097972481.

It can be written as a sum of positive squares in 4 ways, for example, as 2801479041 + 15626500036 = 52929^2 + 125006^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18427979077 - 2²⁷ = 18293761349 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 (18427979057) 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, 176299 + ... + 260647.

It is an arithmetic number, because the mean of its divisors is an integer number (2317305375).

Almost surely, 2^18427979077 is an apocalyptic number.

It is an amenable number.

18427979077 is a deficient number, since it is larger than the sum of its proper divisors (110463923).

18427979077 is a wasteful number, since it uses less digits than its factorization.

18427979077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85655.

The product of its (nonzero) digits is 12446784, while the sum is 61.

The spelling of 18427979077 in words is "eighteen billion, four hundred twenty-seven million, nine hundred seventy-nine thousand, seventy-seven".