18696544425 has 72 divisors (see below), whose sum is σ = 36303245888. Its totient is φ = 9143280000.

The previous prime is 18696544421. The next prime is 18696544429. The reversal of 18696544425 is 52444569681.

It is a happy number.

18696544425 is a `hidden beast` number, since 1 + 8 + 6 + 96 + 544 + 4 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (18696544421) and next prime (18696544429).

It is not a de Polignac number, because 18696544425 - 2² = 18696544421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18696544421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 420510 + ... + 462840.

Almost surely, 2^18696544425 is an apocalyptic number.

18696544425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18696544425 is a deficient number, since it is larger than the sum of its proper divisors (17606701463).

18696544425 is a wasteful number, since it uses less digits than its factorization.

18696544425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42511 (or 42503 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 18696544425 in words is "eighteen billion, six hundred ninety-six million, five hundred forty-four thousand, four hundred twenty-five".