661956339 has 16 divisors (see below), whose sum is σ = 963515520. Its totient is φ = 400906560.

The previous prime is 661956271. The next prime is 661956391. The reversal of 661956339 is 933659166.

It is not a de Polignac number, because 661956339 - 2⁸ = 661956083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661956739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47527 + ... + 59855.

It is an arithmetic number, because the mean of its divisors is an integer number (60219720).

Almost surely, 2^661956339 is an apocalyptic number.

661956339 is a deficient number, since it is larger than the sum of its proper divisors (301559181).

661956339 is a wasteful number, since it uses less digits than its factorization.

661956339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13970.

The product of its digits is 787320, while the sum is 48.

The square root of 661956339 is about 25728.5121800698. The cubic root of 661956339 is about 871.5181749368.

The spelling of 661956339 in words is "six hundred sixty-one million, nine hundred fifty-six thousand, three hundred thirty-nine".