661612652 has 12 divisors (see below), whose sum is σ = 1158912720. Its totient is φ = 330494736.

The previous prime is 661612643. The next prime is 661612667. The reversal of 661612652 is 256216166.

It is an unprimeable number.

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, 73088 + ... + 81639.

It is an arithmetic number, because the mean of its divisors is an integer number (96576060).

Almost surely, 2^661612652 is an apocalyptic number.

It is an amenable number.

661612652 is a deficient number, since it is larger than the sum of its proper divisors (497300068).

661612652 is a wasteful number, since it uses less digits than its factorization.

661612652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155800 (or 155798 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 661612652 is about 25721.8322053465. The cubic root of 661612652 is about 871.3673184010.

The spelling of 661612652 in words is "six hundred sixty-one million, six hundred twelve thousand, six hundred fifty-two".