660383539278 has 32 divisors (see below), whose sum is σ = 1366387932960. Its totient is φ = 212525228160.

The previous prime is 660383539243. The next prime is 660383539297. The reversal of 660383539278 is 872935383066.

It is a happy number.

It is a super-2 number, since 2×660383539278² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3291568 + ... + 3486428.

It is an arithmetic number, because the mean of its divisors is an integer number (42699622905).

Almost surely, 2^660383539278 is an apocalyptic number.

660383539278 is an abundant number, since it is smaller than the sum of its proper divisors (706004393682).

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

660383539278 is a wasteful number, since it uses less digits than its factorization.

660383539278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214372.

The product of its (nonzero) digits is 39191040, while the sum is 60.

The spelling of 660383539278 in words is "six hundred sixty billion, three hundred eighty-three million, five hundred thirty-nine thousand, two hundred seventy-eight".