64540806684759 has 24 divisors (see below), whose sum is σ = 93440570102880. Its totient is φ = 42927997405248.

The previous prime is 64540806684751. The next prime is 64540806684797. The reversal of 64540806684759 is 95748660804546.

It is a happy number.

64540806684759 is a `hidden beast` number, since 6 + 4 + 540 + 8 + 0 + 6 + 6 + 8 + 4 + 75 + 9 = 666.

It is not a de Polignac number, because 64540806684759 - 2³ = 64540806684751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64540806684751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155133729 + ... + 155549205.

It is an arithmetic number, because the mean of its divisors is an integer number (3893357087620).

Almost surely, 2^{64540806684759} is an apocalyptic number.

64540806684759 is a deficient number, since it is larger than the sum of its proper divisors (28899763418121).

64540806684759 is a wasteful number, since it uses less digits than its factorization.

64540806684759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455239 (or 455236 counting only the distinct ones).

The product of its (nonzero) digits is 1393459200, while the sum is 72.

The spelling of 64540806684759 in words is "sixty-four trillion, five hundred forty billion, eight hundred six million, six hundred eighty-four thousand, seven hundred fifty-nine".