665137802700 has 864 divisors, whose sum is σ = 2723585679360. Its totient is φ = 132133478400.

The previous prime is 665137802689. The next prime is 665137802711. The reversal of 665137802700 is 7208731566.

665137802700 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 378 + 0 + 270 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (665137802689) and next prime (665137802711).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 71431045 + ... + 71440355.

It is an arithmetic number, because the mean of its divisors is an integer number (3152298240).

Almost surely, 2^665137802700 is an apocalyptic number.

665137802700 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 665137802700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1361792839680).

665137802700 is an abundant number, since it is smaller than the sum of its proper divisors (2058447876660).

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

665137802700 is a wasteful number, since it uses less digits than its factorization.

665137802700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9407 (or 9397 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 665137802700 in words is "six hundred sixty-five billion, one hundred thirty-seven million, eight hundred two thousand, seven hundred".