18687373687 has 4 divisors (see below), whose sum is σ = 18688540000. Its totient is φ = 18686207376.

The previous prime is 18687373657. The next prime is 18687373693. The reversal of 18687373687 is 78637378681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78637378681 = 152393 ⋅516017.

It is a cyclic number.

It is not a de Polignac number, because 18687373687 - 2¹¹ = 18687371639 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 (18687373657) 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, 558783 + ... + 591280.

It is an arithmetic number, because the mean of its divisors is an integer number (4672135000).

Almost surely, 2^18687373687 is an apocalyptic number.

18687373687 is a deficient number, since it is larger than the sum of its proper divisors (1166313).

18687373687 is a wasteful number, since it uses less digits than its factorization.

18687373687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166312.

The product of its digits is 56899584, while the sum is 64.

The spelling of 18687373687 in words is "eighteen billion, six hundred eighty-seven million, three hundred seventy-three thousand, six hundred eighty-seven".