665708602746 has 64 divisors (see below), whose sum is σ = 1475484180480. Its totient is φ = 198547527360.

The previous prime is 665708602723. The next prime is 665708602771. The reversal of 665708602746 is 647206807566.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1451455 + ... + 1854221.

It is an arithmetic number, because the mean of its divisors is an integer number (23054440320).

Almost surely, 2^665708602746 is an apocalyptic number.

665708602746 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 665708602746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737742090240).

665708602746 is an abundant number, since it is smaller than the sum of its proper divisors (809775577734).

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

665708602746 is a wasteful number, since it uses less digits than its factorization.

665708602746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403179.

The product of its (nonzero) digits is 20321280, while the sum is 57.

The spelling of 665708602746 in words is "six hundred sixty-five billion, seven hundred eight million, six hundred two thousand, seven hundred forty-six".