18855715377 has 16 divisors (see below), whose sum is σ = 25765286400. Its totient is φ = 12258576000.

The previous prime is 18855715369. The next prime is 18855715397. The reversal of 18855715377 is 77351755881.

It is not a de Polignac number, because 18855715377 - 2³ = 18855715369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18855715367) 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, 263127 + ... + 327027.

It is an arithmetic number, because the mean of its divisors is an integer number (1610330400).

Almost surely, 2^18855715377 is an apocalyptic number.

It is an amenable number.

18855715377 is a deficient number, since it is larger than the sum of its proper divisors (6909571023).

18855715377 is a wasteful number, since it uses less digits than its factorization.

18855715377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66344.

The product of its digits is 8232000, while the sum is 57.

The spelling of 18855715377 in words is "eighteen billion, eight hundred fifty-five million, seven hundred fifteen thousand, three hundred seventy-seven".