133565406064431 has 12 divisors (see below), whose sum is σ = 195748749384216. Its totient is φ = 80948730947920.

The previous prime is 133565406064217. The next prime is 133565406064457. The reversal of 133565406064431 is 134460604565331.

It is not a de Polignac number, because 133565406064431 - 2¹³ = 133565406056239 is a prime.

It is a super-2 number, since 2×133565406064431² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133565406044431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183974388156 + ... + 183974388881.

It is an arithmetic number, because the mean of its divisors is an integer number (16312395782018).

Almost surely, 2^{133565406064431} is an apocalyptic number.

133565406064431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133565406064431 is a deficient number, since it is larger than the sum of its proper divisors (62183343319785).

133565406064431 is a wasteful number, since it uses less digits than its factorization.

133565406064431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367948777062 (or 367948777051 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 51.

The spelling of 133565406064431 in words is "one hundred thirty-three trillion, five hundred sixty-five billion, four hundred six million, sixty-four thousand, four hundred thirty-one".