661190572 has 48 divisors (see below), whose sum is σ = 1354429440. Its totient is φ = 276579072.

The previous prime is 661190527. The next prime is 661190573. The reversal of 661190572 is 275091166.

It is not an unprimeable number, because it can be changed into a prime (661190573) 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, 210429 + ... + 213547.

It is an arithmetic number, because the mean of its divisors is an integer number (28217280).

Almost surely, 2^661190572 is an apocalyptic number.

It is an amenable number.

661190572 is an abundant number, since it is smaller than the sum of its proper divisors (693238868).

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

661190572 is a wasteful number, since it uses less digits than its factorization.

661190572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 661190572 is about 25713.6261931296. The cubic root of 661190572 is about 871.1819808751.

The spelling of 661190572 in words is "six hundred sixty-one million, one hundred ninety thousand, five hundred seventy-two".