18036575430621 has 32 divisors (see below), whose sum is σ = 27177003847680. Its totient is φ = 10541256105600.

The previous prime is 18036575430617. The next prime is 18036575430631. The reversal of 18036575430621 is 12603457563081.

It is not a de Polignac number, because 18036575430621 - 2² = 18036575430617 is a prime.

It is a super-2 number, since 2×18036575430621² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18036575430631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30860776 + ... + 31439793.

It is an arithmetic number, because the mean of its divisors is an integer number (849281370240).

Almost surely, 2^{18036575430621} is an apocalyptic number.

18036575430621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18036575430621 is a deficient number, since it is larger than the sum of its proper divisors (9140428417059).

18036575430621 is a wasteful number, since it uses less digits than its factorization.

18036575430621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62300897.

The product of its (nonzero) digits is 3628800, while the sum is 51.

The spelling of 18036575430621 in words is "eighteen trillion, thirty-six billion, five hundred seventy-five million, four hundred thirty thousand, six hundred twenty-one".