661251752 has 16 divisors (see below), whose sum is σ = 1416968160. Its totient is φ = 283393584.

The previous prime is 661251749. The next prime is 661251757. The reversal of 661251752 is 257152166.

It is not an unprimeable number, because it can be changed into a prime (661251757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5903978 + ... + 5904089.

It is an arithmetic number, because the mean of its divisors is an integer number (88560510).

Almost surely, 2^661251752 is an apocalyptic number.

It is an amenable number.

661251752 is an abundant number, since it is smaller than the sum of its proper divisors (755716408).

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

661251752 is a wasteful number, since it uses less digits than its factorization.

661251752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11808080 (or 11808076 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 661251752 is about 25714.8158072346. The cubic root of 661251752 is about 871.2088502186.

The spelling of 661251752 in words is "six hundred sixty-one million, two hundred fifty-one thousand, seven hundred fifty-two".