64649783101751 has 4 divisors (see below), whose sum is σ = 64649823139104. Its totient is φ = 64649743064400.

The previous prime is 64649783101723. The next prime is 64649783101763. The reversal of 64649783101751 is 15710138794646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64649783101751 - 2³⁸ = 64374905194807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64649783101051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17490110 + ... + 20861531.

It is an arithmetic number, because the mean of its divisors is an integer number (16162455784776).

Almost surely, 2^{64649783101751} is an apocalyptic number.

64649783101751 is a deficient number, since it is larger than the sum of its proper divisors (40037353).

64649783101751 is a wasteful number, since it uses less digits than its factorization.

64649783101751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40037352.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 64649783101751 in words is "sixty-four trillion, six hundred forty-nine billion, seven hundred eighty-three million, one hundred one thousand, seven hundred fifty-one".