18138702216490 has 32 divisors (see below), whose sum is σ = 34371472763520. Its totient is φ = 6872932390464.

The previous prime is 18138702216421. The next prime is 18138702216493. The reversal of 18138702216490 is 9461220783181.

It is not an unprimeable number, because it can be changed into a prime (18138702216493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2805109 + ... + 6644248.

It is an arithmetic number, because the mean of its divisors is an integer number (1074108523860).

Almost surely, 2^{18138702216490} is an apocalyptic number.

18138702216490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18138702216490 is a deficient number, since it is larger than the sum of its proper divisors (16232770547030).

18138702216490 is a wasteful number, since it uses less digits than its factorization.

18138702216490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9459486.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 18138702216490 in words is "eighteen trillion, one hundred thirty-eight billion, seven hundred two million, two hundred sixteen thousand, four hundred ninety".