64731491846081 has 8 divisors (see below), whose sum is σ = 64759009459200. Its totient is φ = 64703976966720.

The previous prime is 64731491846071. The next prime is 64731491846111. The reversal of 64731491846081 is 18064819413746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64731491846081 is a prime.

It is a super-2 number, since 2×64731491846081² (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 (64731491846071) 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, 47401400 + ... + 48747878.

It is an arithmetic number, because the mean of its divisors is an integer number (8094876182400).

Almost surely, 2^{64731491846081} is an apocalyptic number.

It is an amenable number.

64731491846081 is a deficient number, since it is larger than the sum of its proper divisors (27517613119).

64731491846081 is a wasteful number, since it uses less digits than its factorization.

64731491846081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366879.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The spelling of 64731491846081 in words is "sixty-four trillion, seven hundred thirty-one billion, four hundred ninety-one million, eight hundred forty-six thousand, eighty-one".