661032992 has 12 divisors (see below), whose sum is σ = 1301408766. Its totient is φ = 330516480.

The previous prime is 661032979. The next prime is 661032997. The reversal of 661032992 is 299230166.

It can be written as a sum of positive squares in only one way, i.e., 332843536 + 328189456 = 18244^2 + 18116^2 .

It is not an unprimeable number, because it can be changed into a prime (661032997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328609 + ... + 10328672.

Almost surely, 2^661032992 is an apocalyptic number.

It is an amenable number.

661032992 is a deficient number, since it is larger than the sum of its proper divisors (640375774).

661032992 is a wasteful number, since it uses less digits than its factorization.

661032992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20657291 (or 20657283 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 661032992 is about 25710.5618763962. The cubic root of 661032992 is about 871.1127664560.

The spelling of 661032992 in words is "six hundred sixty-one million, thirty-two thousand, nine hundred ninety-two".