665170881738 has 32 divisors (see below), whose sum is σ = 1452649920192. Its totient is φ = 201376934400.

The previous prime is 665170881733. The next prime is 665170881743. The reversal of 665170881738 is 837188071566.

It is an interprime number because it is at equal distance from previous prime (665170881733) and next prime (665170881743).

It is not an unprimeable number, because it can be changed into a prime (665170881733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4679431 + ... + 4819482.

It is an arithmetic number, because the mean of its divisors is an integer number (45395310006).

Almost surely, 2^665170881738 is an apocalyptic number.

665170881738 is an abundant number, since it is smaller than the sum of its proper divisors (787479038454).

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

665170881738 is a wasteful number, since it uses less digits than its factorization.

665170881738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499990.

The product of its (nonzero) digits is 13547520, while the sum is 60.

The spelling of 665170881738 in words is "six hundred sixty-five billion, one hundred seventy million, eight hundred eighty-one thousand, seven hundred thirty-eight".