18697912201 has 4 divisors (see below), whose sum is σ = 18872659152. Its totient is φ = 18523165252.

The previous prime is 18697912171. The next prime is 18697912231. The reversal of 18697912201 is 10221979681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10221979681 = 619 ⋅16513699.

It is an interprime number because it is at equal distance from previous prime (18697912171) and next prime (18697912231).

It is a cyclic number.

It is not a de Polignac number, because 18697912201 - 2⁷ = 18697912073 is a prime.

It is a super-2 number, since 2×18697912201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18697912231) 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, 87373315 + ... + 87373528.

It is an arithmetic number, because the mean of its divisors is an integer number (4718164788).

Almost surely, 2^18697912201 is an apocalyptic number.

It is an amenable number.

18697912201 is a deficient number, since it is larger than the sum of its proper divisors (174746951).

18697912201 is a wasteful number, since it uses less digits than its factorization.

18697912201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174746950.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 18697912201 in words is "eighteen billion, six hundred ninety-seven million, nine hundred twelve thousand, two hundred one".