660994538 has 16 divisors (see below), whose sum is σ = 1039300416. Its totient is φ = 314936160.

The previous prime is 660994519. The next prime is 660994549. The reversal of 660994538 is 835499066.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90206 + ... + 97257.

It is an arithmetic number, because the mean of its divisors is an integer number (64956276).

Almost surely, 2^660994538 is an apocalyptic number.

660994538 is a deficient number, since it is larger than the sum of its proper divisors (378305878).

660994538 is a wasteful number, since it uses less digits than its factorization.

660994538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187549.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 660994538 is about 25709.8140405566. The cubic root of 660994538 is about 871.0958745004.

The spelling of 660994538 in words is "six hundred sixty million, nine hundred ninety-four thousand, five hundred thirty-eight".