665475168280 has 32 divisors (see below), whose sum is σ = 1612497524400. Its totient is φ = 245713908096.

The previous prime is 665475168271. The next prime is 665475168299. The reversal of 665475168280 is 82861574566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639879450 + ... + 639880489.

Almost surely, 2^665475168280 is an apocalyptic number.

It is an amenable number.

665475168280 is an abundant number, since it is smaller than the sum of its proper divisors (947022356120).

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

665475168280 is a wasteful number, since it uses less digits than its factorization.

665475168280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279759963 (or 1279759959 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 58.

The spelling of 665475168280 in words is "six hundred sixty-five billion, four hundred seventy-five million, one hundred sixty-eight thousand, two hundred eighty".