64736123637681 has 8 divisors (see below), whose sum is σ = 95905368352160. Its totient is φ = 43157415758436.

The previous prime is 64736123637649. The next prime is 64736123637739. The reversal of 64736123637681 is 18673632163746.

64736123637681 is a `hidden beast` number, since 6 + 4 + 7 + 3 + 612 + 3 + 6 + 3 + 7 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 64736123637681 - 2⁵ = 64736123637649 is a prime.

It is a super-2 number, since 2×64736123637681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64736193637681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1198817104375 + ... + 1198817104428.

It is an arithmetic number, because the mean of its divisors is an integer number (11988171044020).

Almost surely, 2^{64736123637681} is an apocalyptic number.

It is an amenable number.

64736123637681 is a deficient number, since it is larger than the sum of its proper divisors (31169244714479).

64736123637681 is a wasteful number, since it uses less digits than its factorization.

64736123637681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397634208812 (or 2397634208806 counting only the distinct ones).

The product of its digits is 109734912, while the sum is 63.

The spelling of 64736123637681 in words is "sixty-four trillion, seven hundred thirty-six billion, one hundred twenty-three million, six hundred thirty-seven thousand, six hundred eighty-one".