660921692 has 6 divisors (see below), whose sum is σ = 1156612968. Its totient is φ = 330460844.

The previous prime is 660921689. The next prime is 660921749. The reversal of 660921692 is 296129066.

It is a super-2 number, since 2×660921692² = 873634965912285728, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 82615208 + ... + 82615215.

It is an arithmetic number, because the mean of its divisors is an integer number (192768828).

Almost surely, 2^660921692 is an apocalyptic number.

It is an amenable number.

660921692 is a deficient number, since it is larger than the sum of its proper divisors (495691276).

660921692 is a wasteful number, since it uses less digits than its factorization.

660921692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165230427 (or 165230425 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 660921692 is about 25708.3973051608. The cubic root of 660921692 is about 871.0638731360.

The spelling of 660921692 in words is "six hundred sixty million, nine hundred twenty-one thousand, six hundred ninety-two".