18688295377 has 4 divisors (see below), whose sum is σ = 18689878116. Its totient is φ = 18686712640.

The previous prime is 18688295357. The next prime is 18688295399. The reversal of 18688295377 is 77359288681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9829532736 + 8858762641 = 99144^2 + 94121^2 .

It is a cyclic number.

It is not a de Polignac number, because 18688295377 - 2¹⁵ = 18688262609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18688295357) 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, 773524 + ... + 797317.

It is an arithmetic number, because the mean of its divisors is an integer number (4672469529).

Almost surely, 2^18688295377 is an apocalyptic number.

It is an amenable number.

18688295377 is a deficient number, since it is larger than the sum of its proper divisors (1582739).

18688295377 is a wasteful number, since it uses less digits than its factorization.

18688295377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582738.

The product of its digits is 40642560, while the sum is 64.

The spelling of 18688295377 in words is "eighteen billion, six hundred eighty-eight million, two hundred ninety-five thousand, three hundred seventy-seven".