66701575721458 has 16 divisors (see below), whose sum is σ = 100071795394080. Its totient is φ = 33344310938400.

The previous prime is 66701575721401. The next prime is 66701575721477. The reversal of 66701575721458 is 85412757510766.

It is a self number, because there is not a number n which added to its sum of digits gives 66701575721458.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537251553 + ... + 537375691.

It is an arithmetic number, because the mean of its divisors is an integer number (6254487212130).

Almost surely, 2^{66701575721458} is an apocalyptic number.

66701575721458 is a deficient number, since it is larger than the sum of its proper divisors (33370219672622).

66701575721458 is a wasteful number, since it uses less digits than its factorization.

66701575721458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174153.

The product of its (nonzero) digits is 98784000, while the sum is 64.

The spelling of 66701575721458 in words is "sixty-six trillion, seven hundred one billion, five hundred seventy-five million, seven hundred twenty-one thousand, four hundred fifty-eight".