18172094621632 has 56 divisors (see below), whose sum is σ = 41212252510560. Its totient is φ = 7787938897920.

The previous prime is 18172094621591. The next prime is 18172094621683. The reversal of 18172094621632 is 23612649027181.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×18172094621632² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18172094621632.

It is a congruent number.

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, 41410344 + ... + 41846872.

Almost surely, 2^{18172094621632} is an apocalyptic number.

It is an amenable number.

18172094621632 is an abundant number, since it is smaller than the sum of its proper divisors (23040157888928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18172094621632 is an equidigital number, since it uses as much as digits as its factorization.

18172094621632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529469 (or 529459 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 18172094621632 in words is "eighteen trillion, one hundred seventy-two billion, ninety-four million, six hundred twenty-one thousand, six hundred thirty-two".