660389739456 has 112 divisors (see below), whose sum is σ = 1815109164288. Its totient is φ = 211735910400.

The previous prime is 660389739421. The next prime is 660389739511. The reversal of 660389739456 is 654937983066.

It is a super-2 number, since 2×660389739456² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 31870 + ... + 1149693.

It is an arithmetic number, because the mean of its divisors is an integer number (16206331824).

Almost surely, 2^660389739456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660389739456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907554582144).

660389739456 is an abundant number, since it is smaller than the sum of its proper divisors (1154719424832).

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

660389739456 is a wasteful number, since it uses less digits than its factorization.

660389739456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181690 (or 1181680 counting only the distinct ones).

The product of its (nonzero) digits is 176359680, while the sum is 66.

The spelling of 660389739456 in words is "six hundred sixty billion, three hundred eighty-nine million, seven hundred thirty-nine thousand, four hundred fifty-six".