64659720945 has 32 divisors (see below), whose sum is σ = 109474136064. Its totient is φ = 32521227200.

The previous prime is 64659720893. The next prime is 64659720977. The reversal of 64659720945 is 54902795646.

It is not a de Polignac number, because 64659720945 - 2¹³ = 64659712753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1295361 + ... + 1344350.

It is an arithmetic number, because the mean of its divisors is an integer number (3421066752).

Almost surely, 2^64659720945 is an apocalyptic number.

It is an amenable number.

64659720945 is a deficient number, since it is larger than the sum of its proper divisors (44814415119).

64659720945 is a wasteful number, since it uses less digits than its factorization.

64659720945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639813.

The product of its (nonzero) digits is 16329600, while the sum is 57.

The spelling of 64659720945 in words is "sixty-four billion, six hundred fifty-nine million, seven hundred twenty thousand, nine hundred forty-five".