665020151720 has 32 divisors (see below), whose sum is σ = 1561351662720. Its totient is φ = 254442492480.

The previous prime is 665020151713. The next prime is 665020151771. The reversal of 665020151720 is 27151020566.

665020151720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 361423076 + ... + 361424915.

It is an arithmetic number, because the mean of its divisors is an integer number (48792239460).

Almost surely, 2^665020151720 is an apocalyptic number.

It is an amenable number.

665020151720 is an abundant number, since it is smaller than the sum of its proper divisors (896331511000).

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

665020151720 is a wasteful number, since it uses less digits than its factorization.

665020151720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722848025 (or 722848021 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 665020151720 in words is "six hundred sixty-five billion, twenty million, one hundred fifty-one thousand, seven hundred twenty".