661082272 has 12 divisors (see below), whose sum is σ = 1301505786. Its totient is φ = 330541120.

The previous prime is 661082267. The next prime is 661082287. The reversal of 661082272 is 272280166.

It can be written as a sum of positive squares in only one way, i.e., 609299856 + 51782416 = 24684^2 + 7196^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10329379 + ... + 10329442.

Almost surely, 2^661082272 is an apocalyptic number.

It is an amenable number.

661082272 is a deficient number, since it is larger than the sum of its proper divisors (640423514).

661082272 is a wasteful number, since it uses less digits than its factorization.

661082272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20658831 (or 20658823 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 661082272 is about 25711.5202195436. The cubic root of 661082272 is about 871.1344130662.

The spelling of 661082272 in words is "six hundred sixty-one million, eighty-two thousand, two hundred seventy-two".