64511136531 has 16 divisors (see below), whose sum is σ = 97605504000. Its totient is φ = 42092371944.

The previous prime is 64511136523. The next prime is 64511136533. The reversal of 64511136531 is 13563111546.

64511136531 is a `hidden beast` number, since 6 + 4 + 5 + 1 + 113 + 6 + 531 = 666.

It is not a de Polignac number, because 64511136531 - 2³ = 64511136523 is a prime.

It is a super-2 number, since 2×64511136531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64511136533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25416831 + ... + 25419368.

It is an arithmetic number, because the mean of its divisors is an integer number (6100344000).

Almost surely, 2^64511136531 is an apocalyptic number.

64511136531 is a deficient number, since it is larger than the sum of its proper divisors (33094367469).

64511136531 is a wasteful number, since it uses less digits than its factorization.

64511136531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50836255 (or 50836249 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The spelling of 64511136531 in words is "sixty-four billion, five hundred eleven million, one hundred thirty-six thousand, five hundred thirty-one".