660609673380 has 240 divisors, whose sum is σ = 2160573839424. Its totient is φ = 168818307840.

The previous prime is 660609673379. The next prime is 660609673393. The reversal of 660609673380 is 83376906066.

It is a happy number.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3602515 + ... + 3781445.

Almost surely, 2^660609673380 is an apocalyptic number.

660609673380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660609673380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080286919712).

660609673380 is an abundant number, since it is smaller than the sum of its proper divisors (1499964166044).

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

660609673380 is a wasteful number, since it uses less digits than its factorization.

660609673380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179048 (or 179037 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 660609673380 in words is "six hundred sixty billion, six hundred nine million, six hundred seventy-three thousand, three hundred eighty".