18439655377 has 16 divisors (see below), whose sum is σ = 21669455808. Its totient is φ = 15469490880.

The previous prime is 18439655359. The next prime is 18439655393. The reversal of 18439655377 is 77355693481.

It is a cyclic number.

It is not a de Polignac number, because 18439655377 - 2¹⁵ = 18439622609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18439655317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556323 + ... + 588535.

It is an arithmetic number, because the mean of its divisors is an integer number (1354340988).

Almost surely, 2^18439655377 is an apocalyptic number.

It is an amenable number.

18439655377 is a deficient number, since it is larger than the sum of its proper divisors (3229800431).

18439655377 is a wasteful number, since it uses less digits than its factorization.

18439655377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36240.

The product of its digits is 19051200, while the sum is 58.

The spelling of 18439655377 in words is "eighteen billion, four hundred thirty-nine million, six hundred fifty-five thousand, three hundred seventy-seven".