64307644107665 has 16 divisors (see below), whose sum is σ = 90244348411008. Its totient is φ = 43071166285056.

The previous prime is 64307644107661. The next prime is 64307644107697. The reversal of 64307644107665 is 56670144670346.

It is not a de Polignac number, because 64307644107665 - 2² = 64307644107661 is a prime.

It is a super-2 number, since 2×64307644107665² (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 (64307644107661) 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, 21364664312 + ... + 21364667321.

It is an arithmetic number, because the mean of its divisors is an integer number (5640271775688).

Almost surely, 2^{64307644107665} is an apocalyptic number.

It is an amenable number.

64307644107665 is a deficient number, since it is larger than the sum of its proper divisors (25936704303343).

64307644107665 is a wasteful number, since it uses less digits than its factorization.

64307644107665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42729331688.

The product of its (nonzero) digits is 60963840, while the sum is 59.

The spelling of 64307644107665 in words is "sixty-four trillion, three hundred seven billion, six hundred forty-four million, one hundred seven thousand, six hundred sixty-five".