64402972231 has 4 divisors (see below), whose sum is σ = 69357047032. Its totient is φ = 59448897432.

The previous prime is 64402972219. The next prime is 64402972247. The reversal of 64402972231 is 13227920446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64402972231 - 2⁹ = 64402971719 is a prime.

It is a super-2 number, since 2×64402972231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64402973231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2477037381 + ... + 2477037406.

It is an arithmetic number, because the mean of its divisors is an integer number (17339261758).

Almost surely, 2^64402972231 is an apocalyptic number.

64402972231 is a deficient number, since it is larger than the sum of its proper divisors (4954074801).

64402972231 is a wasteful number, since it uses less digits than its factorization.

64402972231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954074800.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 64402972231 in words is "sixty-four billion, four hundred two million, nine hundred seventy-two thousand, two hundred thirty-one".