64661738115 has 48 divisors (see below), whose sum is σ = 112075741152. Its totient is φ = 31820285952.

The previous prime is 64661738077. The next prime is 64661738131. The reversal of 64661738115 is 51183716646.

It is not a de Polignac number, because 64661738115 - 2⁶ = 64661738051 is a prime.

It is a super-2 number, since 2×64661738115² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 9459739 + ... + 9466571.

It is an arithmetic number, because the mean of its divisors is an integer number (2334911274).

Almost surely, 2^64661738115 is an apocalyptic number.

64661738115 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64661738115 is a deficient number, since it is larger than the sum of its proper divisors (47414003037).

64661738115 is a wasteful number, since it uses less digits than its factorization.

64661738115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600 (or 10587 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The spelling of 64661738115 in words is "sixty-four billion, six hundred sixty-one million, seven hundred thirty-eight thousand, one hundred fifteen".