66109572 has 36 divisors (see below), whose sum is σ = 167359920. Its totient is φ = 22003632.

The previous prime is 66109541. The next prime is 66109573. The reversal of 66109572 is 27590166.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66109573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41079 + ... + 42657.

Almost surely, 2^66109572 is an apocalyptic number.

It is an amenable number.

66109572 is an abundant number, since it is smaller than the sum of its proper divisors (101250348).

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

66109572 is a wasteful number, since it uses less digits than its factorization.

66109572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752 (or 2747 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 66109572 is about 8130.7792984437. The cubic root of 66109572 is about 404.3475181888.

The spelling of 66109572 in words is "sixty-six million, one hundred nine thousand, five hundred seventy-two".