64995668787 has 64 divisors (see below), whose sum is σ = 109382205440. Its totient is φ = 33492009600.

The previous prime is 64995668767. The next prime is 64995668809. The reversal of 64995668787 is 78786659946.

It is a de Polignac number, because none of the positive numbers 2^k-64995668787 is a prime.

It is a super-2 number, since 2×64995668787² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64995668737) 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 63 ways as a sum of consecutive naturals, for example, 711438 + ... + 797580.

It is an arithmetic number, because the mean of its divisors is an integer number (1709096960).

Almost surely, 2^64995668787 is an apocalyptic number.

64995668787 is a deficient number, since it is larger than the sum of its proper divisors (44386536653).

64995668787 is a wasteful number, since it uses less digits than its factorization.

64995668787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86264.

The product of its digits is 1097349120, while the sum is 75.

The spelling of 64995668787 in words is "sixty-four billion, nine hundred ninety-five million, six hundred sixty-eight thousand, seven hundred eighty-seven".