64775979639 has 32 divisors (see below), whose sum is σ = 109921328640. Its totient is φ = 36931242816.

The previous prime is 64775979629. The next prime is 64775979679. The reversal of 64775979639 is 93697957746.

64775979639 is a `hidden beast` number, since 6 + 477 + 5 + 97 + 9 + 63 + 9 = 666.

It is not a de Polignac number, because 64775979639 - 2⁴ = 64775979623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64775979629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303102 + ... + 470555.

It is an arithmetic number, because the mean of its divisors is an integer number (3435041520).

Almost surely, 2^64775979639 is an apocalyptic number.

64775979639 is a deficient number, since it is larger than the sum of its proper divisors (45145349001).

64775979639 is a wasteful number, since it uses less digits than its factorization.

64775979639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774116 (or 774110 counting only the distinct ones).

The product of its digits is 540101520, while the sum is 72.

The spelling of 64775979639 in words is "sixty-four billion, seven hundred seventy-five million, nine hundred seventy-nine thousand, six hundred thirty-nine".