64540342758436 has 24 divisors (see below), whose sum is σ = 114867725314496. Its totient is φ = 31721642975520.

The previous prime is 64540342758433. The next prime is 64540342758443. The reversal of 64540342758436 is 63485724304546.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is not an unprimeable number, because it can be changed into a prime (64540342758431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80890536 + ... + 81684511.

Almost surely, 2^{64540342758436} is an apocalyptic number.

It is an amenable number.

64540342758436 is a deficient number, since it is larger than the sum of its proper divisors (50327382556060).

64540342758436 is a wasteful number, since it uses less digits than its factorization.

64540342758436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162576739 (or 162576737 counting only the distinct ones).

The product of its (nonzero) digits is 232243200, while the sum is 61.

The spelling of 64540342758436 in words is "sixty-four trillion, five hundred forty billion, three hundred forty-two million, seven hundred fifty-eight thousand, four hundred thirty-six".