660600138 has 16 divisors (see below), whose sum is σ = 1441309536. Its totient is φ = 200181840.

The previous prime is 660600137. The next prime is 660600139. The reversal of 660600138 is 831006066.

It is an interprime number because it is at equal distance from previous prime (660600137) and next prime (660600139).

It is not an unprimeable number, because it can be changed into a prime (660600137) by changing a digit.

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, 5004481 + ... + 5004612.

It is an arithmetic number, because the mean of its divisors is an integer number (90081846).

Almost surely, 2^660600138 is an apocalyptic number.

660600138 is an abundant number, since it is smaller than the sum of its proper divisors (780709398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660600138 is a wasteful number, since it uses less digits than its factorization.

660600138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009109.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 660600138 is about 25702.1426733259. The cubic root of 660600138 is about 870.9225858436.

The spelling of 660600138 in words is "six hundred sixty million, six hundred thousand, one hundred thirty-eight".