660138478 has 8 divisors (see below), whose sum is σ = 996765840. Its totient is φ = 327883200.

The previous prime is 660138469. The next prime is 660138481. The reversal of 660138478 is 874831066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1092643 + ... + 1093246.

It is an arithmetic number, because the mean of its divisors is an integer number (124595730).

Almost surely, 2^660138478 is an apocalyptic number.

660138478 is a deficient number, since it is larger than the sum of its proper divisors (336627362).

660138478 is a wasteful number, since it uses less digits than its factorization.

660138478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186042.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 660138478 is about 25693.1601403953. The cubic root of 660138478 is about 870.7196573263.

The spelling of 660138478 in words is "six hundred sixty million, one hundred thirty-eight thousand, four hundred seventy-eight".