64677790713 has 4 divisors (see below), whose sum is σ = 86237054288. Its totient is φ = 43118527140.

The previous prime is 64677790687. The next prime is 64677790721. The reversal of 64677790713 is 31709777646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64677790713 - 2⁹ = 64677790201 is a prime.

It is a super-2 number, since 2×64677790713² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64677790783) 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, 10779631783 + ... + 10779631788.

It is an arithmetic number, because the mean of its divisors is an integer number (21559263572).

Almost surely, 2^64677790713 is an apocalyptic number.

It is an amenable number.

64677790713 is a deficient number, since it is larger than the sum of its proper divisors (21559263575).

64677790713 is a wasteful number, since it uses less digits than its factorization.

64677790713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21559263574.

The product of its (nonzero) digits is 9335088, while the sum is 57.

The spelling of 64677790713 in words is "sixty-four billion, six hundred seventy-seven million, seven hundred ninety thousand, seven hundred thirteen".