661413652 has 24 divisors (see below), whose sum is σ = 1172283840. Its totient is φ = 326496960.

The previous prime is 661413647. The next prime is 661413689. The reversal of 661413652 is 256314166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130624 + ... + 135592.

It is an arithmetic number, because the mean of its divisors is an integer number (48845160).

Almost surely, 2^661413652 is an apocalyptic number.

It is an amenable number.

661413652 is a deficient number, since it is larger than the sum of its proper divisors (510870188).

661413652 is a wasteful number, since it uses less digits than its factorization.

661413652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391 (or 5389 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 661413652 is about 25717.9636052313. The cubic root of 661413652 is about 871.2799462888.

The spelling of 661413652 in words is "six hundred sixty-one million, four hundred thirteen thousand, six hundred fifty-two".