61666572 has 24 divisors (see below), whose sum is σ = 156969792. Its totient is φ = 18686800.

The previous prime is 61666559. The next prime is 61666573. The reversal of 61666572 is 27566616.

It is a super-2 number, since 2×61666572² = 7605532204462368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61666572.

It is not an unprimeable number, because it can be changed into a prime (61666573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233454 + ... + 233717.

It is an arithmetic number, because the mean of its divisors is an integer number (6540408).

Almost surely, 2^61666572 is an apocalyptic number.

It is an amenable number.

61666572 is an abundant number, since it is smaller than the sum of its proper divisors (95303220).

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

61666572 is a wasteful number, since it uses less digits than its factorization.

61666572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467189 (or 467187 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 61666572 is about 7852.8066320265. The cubic root of 61666572 is about 395.0783842734.

The spelling of 61666572 in words is "sixty-one million, six hundred sixty-six thousand, five hundred seventy-two".