18622721374 has 16 divisors (see below), whose sum is σ = 30153733920. Its totient is φ = 8599396960.

The previous prime is 18622721339. The next prime is 18622721387. The reversal of 18622721374 is 47312722681.

It is a self number, because there is not a number n which added to its sum of digits gives 18622721374.

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, 6978697 + ... + 6981364.

It is an arithmetic number, because the mean of its divisors is an integer number (1884608370).

Almost surely, 2^18622721374 is an apocalyptic number.

18622721374 is a deficient number, since it is larger than the sum of its proper divisors (11531012546).

18622721374 is a wasteful number, since it uses less digits than its factorization.

18622721374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13960115.

The product of its digits is 225792, while the sum is 43.

The spelling of 18622721374 in words is "eighteen billion, six hundred twenty-two million, seven hundred twenty-one thousand, three hundred seventy-four".