18121648574 has 16 divisors (see below), whose sum is σ = 27665550000. Its totient is φ = 8900047104.

The previous prime is 18121648547. The next prime is 18121648591. The reversal of 18121648574 is 47584612181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85904 + ... + 208860.

It is an arithmetic number, because the mean of its divisors is an integer number (1729096875).

Almost surely, 2^18121648574 is an apocalyptic number.

18121648574 is a deficient number, since it is larger than the sum of its proper divisors (9543901426).

18121648574 is a wasteful number, since it uses less digits than its factorization.

18121648574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124267.

The product of its digits is 430080, while the sum is 47.

The spelling of 18121648574 in words is "eighteen billion, one hundred twenty-one million, six hundred forty-eight thousand, five hundred seventy-four".