665748156 has 24 divisors (see below), whose sum is σ = 1620952704. Its totient is φ = 212267440.

The previous prime is 665748137. The next prime is 665748199. The reversal of 665748156 is 651847566.

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, 1205790 + ... + 1206341.

It is an arithmetic number, because the mean of its divisors is an integer number (67539696).

Almost surely, 2^665748156 is an apocalyptic number.

It is an amenable number.

665748156 is an abundant number, since it is smaller than the sum of its proper divisors (955204548).

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

665748156 is a wasteful number, since it uses less digits than its factorization.

665748156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412161 (or 2412159 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 665748156 is about 25802.0959613749. The cubic root of 665748156 is about 873.1790838560.

The spelling of 665748156 in words is "six hundred sixty-five million, seven hundred forty-eight thousand, one hundred fifty-six".