661710572 has 12 divisors (see below), whose sum is σ = 1158513720. Its totient is φ = 330706656.

The previous prime is 661710571. The next prime is 661710629. The reversal of 661710572 is 275017166.

It is not an unprimeable number, because it can be changed into a prime (661710571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26822 + ... + 45197.

It is an arithmetic number, because the mean of its divisors is an integer number (96542810).

Almost surely, 2^661710572 is an apocalyptic number.

It is an amenable number.

661710572 is a deficient number, since it is larger than the sum of its proper divisors (496803148).

661710572 is a wasteful number, since it uses less digits than its factorization.

661710572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74320 (or 74318 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 661710572 is about 25723.7355763116. The cubic root of 661710572 is about 871.4103043176.

The spelling of 661710572 in words is "six hundred sixty-one million, seven hundred ten thousand, five hundred seventy-two".