18697996154 has 4 divisors (see below), whose sum is σ = 28046994234. Its totient is φ = 9348998076.

The previous prime is 18697996111. The next prime is 18697996157. The reversal of 18697996154 is 45169979681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45169979681 = 13163 ⋅3431587.

It can be written as a sum of positive squares in only one way, i.e., 18245795929 + 452200225 = 135077^2 + 21265^2 .

It is not an unprimeable number, because it can be changed into a prime (18697996157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4674499037 + ... + 4674499040.

Almost surely, 2^18697996154 is an apocalyptic number.

18697996154 is a deficient number, since it is larger than the sum of its proper divisors (9348998080).

18697996154 is an equidigital number, since it uses as much as digits as its factorization.

18697996154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9348998079.

The product of its digits is 29393280, while the sum is 65.

The spelling of 18697996154 in words is "eighteen billion, six hundred ninety-seven million, nine hundred ninety-six thousand, one hundred fifty-four".