64166669728736 has 24 divisors (see below), whose sum is σ = 126521589156984. Its totient is φ = 32034202641280.

The previous prime is 64166669728657. The next prime is 64166669728781. The reversal of 64166669728736 is 63782796666146.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1535360750 + ... + 1535402541.

It is an arithmetic number, because the mean of its divisors is an integer number (5271732881541).

Almost surely, 2^{64166669728736} is an apocalyptic number.

It is an amenable number.

64166669728736 is a deficient number, since it is larger than the sum of its proper divisors (62354919428248).

64166669728736 is a wasteful number, since it uses less digits than its factorization.

64166669728736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070763954 (or 3070763946 counting only the distinct ones).

The product of its digits is 3950456832, while the sum is 77.

The spelling of 64166669728736 in words is "sixty-four trillion, one hundred sixty-six billion, six hundred sixty-nine million, seven hundred twenty-eight thousand, seven hundred thirty-six".