64651265107729 has 16 divisors (see below), whose sum is σ = 66219625688832. Its totient is φ = 63085879842048.

The previous prime is 64651265107721. The next prime is 64651265107777. The reversal of 64651265107729 is 92770156215646.

It is a cyclic number.

It is not a de Polignac number, because 64651265107729 - 2³ = 64651265107721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64651265107721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197031967 + ... + 197359819.

It is an arithmetic number, because the mean of its divisors is an integer number (4138726605552).

Almost surely, 2^{64651265107729} is an apocalyptic number.

It is an amenable number.

64651265107729 is a deficient number, since it is larger than the sum of its proper divisors (1568360581103).

64651265107729 is a wasteful number, since it uses less digits than its factorization.

64651265107729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332376.

The product of its (nonzero) digits is 38102400, while the sum is 61.

The spelling of 64651265107729 in words is "sixty-four trillion, six hundred fifty-one billion, two hundred sixty-five million, one hundred seven thousand, seven hundred twenty-nine".