64647559137 has 16 divisors (see below), whose sum is σ = 98724269952. Its totient is φ = 36861323520.

The previous prime is 64647559121. The next prime is 64647559139. The reversal of 64647559137 is 73195574646.

It is not a de Polignac number, because 64647559137 - 2⁴ = 64647559121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64647559139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3329208 + ... + 3348569.

It is an arithmetic number, because the mean of its divisors is an integer number (6170266872).

Almost surely, 2^64647559137 is an apocalyptic number.

It is an amenable number.

64647559137 is a deficient number, since it is larger than the sum of its proper divisors (34076710815).

64647559137 is a wasteful number, since it uses less digits than its factorization.

64647559137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678248.

The product of its digits is 19051200, while the sum is 57.

The spelling of 64647559137 in words is "sixty-four billion, six hundred forty-seven million, five hundred fifty-nine thousand, one hundred thirty-seven".