661238252 has 12 divisors (see below), whose sum is σ = 1176780360. Its totient is φ = 325015296.

The previous prime is 661238243. The next prime is 661238257. The reversal of 661238252 is 252832166.

It is not an unprimeable number, because it can be changed into a prime (661238257) 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, 1400693 + ... + 1401164.

It is an arithmetic number, because the mean of its divisors is an integer number (98065030).

Almost surely, 2^661238252 is an apocalyptic number.

It is an amenable number.

661238252 is a deficient number, since it is larger than the sum of its proper divisors (515542108).

661238252 is a wasteful number, since it uses less digits than its factorization.

661238252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801920 (or 2801918 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 661238252 is about 25714.5533113060. The cubic root of 661238252 is about 871.2029213624.

The spelling of 661238252 in words is "six hundred sixty-one million, two hundred thirty-eight thousand, two hundred fifty-two".