66101521722 has 32 divisors (see below), whose sum is σ = 137667530880. Its totient is φ = 21133156800.

The previous prime is 66101521697. The next prime is 66101521723. The reversal of 66101521722 is 22712510166.

It is a super-2 number, since 2×66101521722² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66101521723) 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, 1231653 + ... + 1284200.

It is an arithmetic number, because the mean of its divisors is an integer number (4302110340).

Almost surely, 2^66101521722 is an apocalyptic number.

66101521722 is an abundant number, since it is smaller than the sum of its proper divisors (71566009158).

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

66101521722 is a wasteful number, since it uses less digits than its factorization.

66101521722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516038.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 66101521722 in words is "sixty-six billion, one hundred one million, five hundred twenty-one thousand, seven hundred twenty-two".