20472557166591 has 16 divisors (see below), whose sum is σ = 29392305408000. Its totient is φ = 12627805282688.

The previous prime is 20472557166577. The next prime is 20472557166637. The reversal of 20472557166591 is 19566175527402.

It is a cyclic number.

It is not a de Polignac number, because 20472557166591 - 2⁶ = 20472557166527 is a prime.

It is a super-2 number, since 2×20472557166591² (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 (20472557161591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3401884191 + ... + 3401890208.

It is an arithmetic number, because the mean of its divisors is an integer number (1837019088000).

Almost surely, 2^{20472557166591} is an apocalyptic number.

20472557166591 is a deficient number, since it is larger than the sum of its proper divisors (8919748241409).

20472557166591 is a wasteful number, since it uses less digits than its factorization.

20472557166591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6803774478.

The product of its (nonzero) digits is 31752000, while the sum is 60.

The spelling of 20472557166591 in words is "twenty trillion, four hundred seventy-two billion, five hundred fifty-seven million, one hundred sixty-six thousand, five hundred ninety-one".