661560614 has 32 divisors (see below), whose sum is σ = 1169665056. Its totient is φ = 276664320.

The previous prime is 661560607. The next prime is 661560623. The reversal of 661560614 is 416065166.

It is a Curzon number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 87014 + ... + 94310.

It is an arithmetic number, because the mean of its divisors is an integer number (36552033).

Almost surely, 2^661560614 is an apocalyptic number.

661560614 is a deficient number, since it is larger than the sum of its proper divisors (508104442).

661560614 is a wasteful number, since it uses less digits than its factorization.

661560614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7640.

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

The square root of 661560614 is about 25720.8206323204. The cubic root of 661560614 is about 871.3444725051.

The spelling of 661560614 in words is "six hundred sixty-one million, five hundred sixty thousand, six hundred fourteen".