660938901 has 24 divisors (see below), whose sum is σ = 1050142464. Its totient is φ = 368464320.

The previous prime is 660938851. The next prime is 660938923. The reversal of 660938901 is 109839066.

It is not a de Polignac number, because 660938901 - 2¹¹ = 660936853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660938401) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 48805 + ... + 60858.

It is an arithmetic number, because the mean of its divisors is an integer number (43755936).

Almost surely, 2^660938901 is an apocalyptic number.

It is an amenable number.

660938901 is a deficient number, since it is larger than the sum of its proper divisors (389203563).

660938901 is a wasteful number, since it uses less digits than its factorization.

660938901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109721 (or 109714 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 660938901 is about 25708.7319990699. The cubic root of 660938901 is about 871.0714332894.

The spelling of 660938901 in words is "six hundred sixty million, nine hundred thirty-eight thousand, nine hundred one".