661993282 has 16 divisors (see below), whose sum is σ = 1025759232. Its totient is φ = 320088960.

The previous prime is 661993249. The next prime is 661993301. The reversal of 661993282 is 282399166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110098 + ... + 115954.

It is an arithmetic number, because the mean of its divisors is an integer number (64109952).

Almost surely, 2^661993282 is an apocalyptic number.

661993282 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

661993282 is a deficient number, since it is larger than the sum of its proper divisors (363765950).

661993282 is a wasteful number, since it uses less digits than its factorization.

661993282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7713.

The product of its digits is 279936, while the sum is 46.

The square root of 661993282 is about 25729.2301089636. The cubic root of 661993282 is about 871.5343874345.

The spelling of 661993282 in words is "six hundred sixty-one million, nine hundred ninety-three thousand, two hundred eighty-two".