66217525570 has 32 divisors (see below), whose sum is σ = 136267099776. Its totient is φ = 22695120000.

The previous prime is 66217525567. The next prime is 66217525589. The reversal of 66217525570 is 7552571266.

It is a super-2 number, since 2×66217525570² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66217525570.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33670 + ... + 365470.

It is an arithmetic number, because the mean of its divisors is an integer number (4258346868).

Almost surely, 2^66217525570 is an apocalyptic number.

66217525570 is an abundant number, since it is smaller than the sum of its proper divisors (70049574206).

66217525570 is a wasteful number, since it uses less digits than its factorization.

66217525570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334666.

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 66217525570 in words is "sixty-six billion, two hundred seventeen million, five hundred twenty-five thousand, five hundred seventy".