660101638 has 12 divisors (see below), whose sum is σ = 1151810172. Its totient is φ = 282900660.

The previous prime is 660101623. The next prime is 660101639. The reversal of 660101638 is 836101066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660101639) 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 5 ways as a sum of consecutive naturals, for example, 3367768 + ... + 3367963.

It is an arithmetic number, because the mean of its divisors is an integer number (95984181).

Almost surely, 2^660101638 is an apocalyptic number.

660101638 is a deficient number, since it is larger than the sum of its proper divisors (491708534).

660101638 is a wasteful number, since it uses less digits than its factorization.

660101638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6735747 (or 6735740 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 660101638 is about 25692.4432080719. The cubic root of 660101638 is about 870.7034597607.

The spelling of 660101638 in words is "six hundred sixty million, one hundred one thousand, six hundred thirty-eight".