660774972 has 96 divisors (see below), whose sum is σ = 1917990144. Its totient is φ = 173952000.

The previous prime is 660774967. The next prime is 660774991. The reversal of 660774972 is 279477066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17847 + ... + 40497.

It is an arithmetic number, because the mean of its divisors is an integer number (19979064).

Almost surely, 2^660774972 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 660774972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958995072).

660774972 is an abundant number, since it is smaller than the sum of its proper divisors (1257215172).

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

660774972 is a wasteful number, since it uses less digits than its factorization.

660774972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22699 (or 22697 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 48.

The square root of 660774972 is about 25705.5436044445. The cubic root of 660774972 is about 870.9994116669. Note that the first 3 decimals are identical.

The spelling of 660774972 in words is "six hundred sixty million, seven hundred seventy-four thousand, nine hundred seventy-two".