18172267336641 has 32 divisors (see below), whose sum is σ = 27077550829056. Its totient is φ = 10744687184000.

The previous prime is 18172267336637. The next prime is 18172267336651. The reversal of 18172267336641 is 14663376227181.

It is not a de Polignac number, because 18172267336641 - 2² = 18172267336637 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18172267336621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141983446 + ... + 142111376.

It is an arithmetic number, because the mean of its divisors is an integer number (846173463408).

Almost surely, 2^{18172267336641} is an apocalyptic number.

18172267336641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18172267336641 is a deficient number, since it is larger than the sum of its proper divisors (8905283492415).

18172267336641 is a wasteful number, since it uses less digits than its factorization.

18172267336641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232973.

The product of its digits is 12192768, while the sum is 57.

The spelling of 18172267336641 in words is "eighteen trillion, one hundred seventy-two billion, two hundred sixty-seven million, three hundred thirty-six thousand, six hundred forty-one".