18201977582399 has 32 divisors (see below), whose sum is σ = 19947324264000. Its totient is φ = 16507804769280.

The previous prime is 18201977582309. The next prime is 18201977582417. The reversal of 18201977582399 is 99328577910281.

It is a cyclic number.

It is not a de Polignac number, because 18201977582399 - 2²⁴ = 18201960805183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201977582309) 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, 386028677 + ... + 386075825.

It is an arithmetic number, because the mean of its divisors is an integer number (623353883250).

Almost surely, 2^{18201977582399} is an apocalyptic number.

18201977582399 is a deficient number, since it is larger than the sum of its proper divisors (1745346681601).

18201977582399 is a wasteful number, since it uses less digits than its factorization.

18201977582399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48795.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 18201977582399 in words is "eighteen trillion, two hundred one billion, nine hundred seventy-seven million, five hundred eighty-two thousand, three hundred ninety-nine".