64643457750475 has 24 divisors (see below), whose sum is σ = 84406321052480. Its totient is φ = 48975750900000.

The previous prime is 64643457750451. The next prime is 64643457750503. The reversal of 64643457750475 is 57405775434646.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-64643457750475 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64643457750475.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22513101 + ... + 25221550.

Almost surely, 2^{64643457750475} is an apocalyptic number.

64643457750475 is a deficient number, since it is larger than the sum of its proper divisors (19762863302005).

64643457750475 is a wasteful number, since it uses less digits than its factorization.

64643457750475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47737531 (or 47737526 counting only the distinct ones).

The product of its (nonzero) digits is 1185408000, while the sum is 67.

The spelling of 64643457750475 in words is "sixty-four trillion, six hundred forty-three billion, four hundred fifty-seven million, seven hundred fifty thousand, four hundred seventy-five".