66001017565122 has 32 divisors (see below), whose sum is σ = 136554390604800. Its totient is φ = 21241619511168.

The previous prime is 66001017565121. The next prime is 66001017565163. The reversal of 66001017565122 is 22156571010066.

It is a super-2 number, since 2×66001017565122² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66001017565121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51877558 + ... + 53134574.

It is an arithmetic number, because the mean of its divisors is an integer number (4267324706400).

Almost surely, 2^{66001017565122} is an apocalyptic number.

66001017565122 is an abundant number, since it is smaller than the sum of its proper divisors (70553373039678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66001017565122 is a wasteful number, since it uses less digits than its factorization.

66001017565122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558810.

The product of its (nonzero) digits is 151200, while the sum is 42.

Adding to 66001017565122 its reverse (22156571010066), we get a palindrome (88157588575188).

The spelling of 66001017565122 in words is "sixty-six trillion, one billion, seventeen million, five hundred sixty-five thousand, one hundred twenty-two".