64655436777231 has 4 divisors (see below), whose sum is σ = 86207249036312. Its totient is φ = 43103624518152.

The previous prime is 64655436777193. The next prime is 64655436777271. The reversal of 64655436777231 is 13277763455646.

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

It is not a de Polignac number, because 64655436777231 - 2²² = 64655432582927 is a prime.

It is a super-2 number, since 2×64655436777231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64655436777271) 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, 10775906129536 + ... + 10775906129541.

It is an arithmetic number, because the mean of its divisors is an integer number (21551812259078).

Almost surely, 2^{64655436777231} is an apocalyptic number.

64655436777231 is a deficient number, since it is larger than the sum of its proper divisors (21551812259081).

64655436777231 is a wasteful number, since it uses less digits than its factorization.

64655436777231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21551812259080.

The product of its digits is 533433600, while the sum is 66.

The spelling of 64655436777231 in words is "sixty-four trillion, six hundred fifty-five billion, four hundred thirty-six million, seven hundred seventy-seven thousand, two hundred thirty-one".