660144138 has 16 divisors (see below), whose sum is σ = 1320644640. Its totient is φ = 219988656.

The previous prime is 660144109. The next prime is 660144143. The reversal of 660144138 is 831441066.

It is a junction number, because it is equal to n+sod(n) for n = 660144099 and 660144108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13356 + ... + 38712.

It is an arithmetic number, because the mean of its divisors is an integer number (82540290).

Almost surely, 2^660144138 is an apocalyptic number.

660144138 is an abundant number, since it is smaller than the sum of its proper divisors (660500502).

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

660144138 is a wasteful number, since it uses less digits than its factorization.

660144138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29701.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 660144138 is about 25693.2702862053. The cubic root of 660144138 is about 870.7221458240.

The spelling of 660144138 in words is "six hundred sixty million, one hundred forty-four thousand, one hundred thirty-eight".