18512725977436 has 6 divisors (see below), whose sum is σ = 32397270460520. Its totient is φ = 9256362988716.

The previous prime is 18512725977407. The next prime is 18512725977451. The reversal of 18512725977436 is 63477952721581.

It is a super-2 number, since 2×18512725977436² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2314090747176 + ... + 2314090747183.

Almost surely, 2^{18512725977436} is an apocalyptic number.

It is an amenable number.

18512725977436 is a deficient number, since it is larger than the sum of its proper divisors (13884544483084).

18512725977436 is a wasteful number, since it uses less digits than its factorization.

18512725977436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628181494363 (or 4628181494361 counting only the distinct ones).

The product of its digits is 177811200, while the sum is 67.

The spelling of 18512725977436 in words is "eighteen trillion, five hundred twelve billion, seven hundred twenty-five million, nine hundred seventy-seven thousand, four hundred thirty-six".