18604901871890 has 16 divisors (see below), whose sum is σ = 34643610382680. Its totient is φ = 7185341412480.

The previous prime is 18604901871833. The next prime is 18604901871947. The reversal of 18604901871890 is 9817810940681.

It is an interprime number because it is at equal distance from previous prime (18604901871833) and next prime (18604901871947).

It can be written as a sum of positive squares in 4 ways, for example, as 15893481875569 + 2711419996321 = 3986663^2 + 1646639^2 .

It is a super-2 number, since 2×18604901871890² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32077416731 + ... + 32077417310.

Almost surely, 2^{18604901871890} is an apocalyptic number.

18604901871890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18604901871890 is a deficient number, since it is larger than the sum of its proper divisors (16038708510790).

18604901871890 is a wasteful number, since it uses less digits than its factorization.

18604901871890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64154834077.

The product of its (nonzero) digits is 6967296, while the sum is 62.

The spelling of 18604901871890 in words is "eighteen trillion, six hundred four billion, nine hundred one million, eight hundred seventy-one thousand, eight hundred ninety".