64590651538 has 12 divisors (see below), whose sum is σ = 112704096222. Its totient is φ = 27681707760.

The previous prime is 64590651529. The next prime is 64590651583. The reversal of 64590651538 is 83515609546.

It can be written as a sum of positive squares in only one way, i.e., 62831939569 + 1758711969 = 250663^2 + 41937^2 .

It is a super-2 number, since 2×64590651538² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 329544043 + ... + 329544238.

Almost surely, 2^64590651538 is an apocalyptic number.

64590651538 is a deficient number, since it is larger than the sum of its proper divisors (48113444684).

64590651538 is a wasteful number, since it uses less digits than its factorization.

64590651538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659088297 (or 659088290 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 64590651538 in words is "sixty-four billion, five hundred ninety million, six hundred fifty-one thousand, five hundred thirty-eight".