661023452 has 12 divisors (see below), whose sum is σ = 1217674920. Its totient is φ = 313116336.

The previous prime is 661023449. The next prime is 661023457. The reversal of 661023452 is 254320166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661023457) 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, 4348763 + ... + 4348914.

It is an arithmetic number, because the mean of its divisors is an integer number (101472910).

Almost surely, 2^661023452 is an apocalyptic number.

It is an amenable number.

661023452 is a deficient number, since it is larger than the sum of its proper divisors (556651468).

661023452 is a wasteful number, since it uses less digits than its factorization.

661023452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8697700 (or 8697698 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 661023452 is about 25710.3763488596. The cubic root of 661023452 is about 871.1085758151.

The spelling of 661023452 in words is "six hundred sixty-one million, twenty-three thousand, four hundred fifty-two".