665723070 has 32 divisors (see below), whose sum is σ = 1775262240. Its totient is φ = 177526080.

The previous prime is 665723041. The next prime is 665723081. The reversal of 665723070 is 70327566.

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 15 ways as a sum of consecutive naturals, for example, 1232551 + ... + 1233090.

It is an arithmetic number, because the mean of its divisors is an integer number (55476945).

Almost surely, 2^665723070 is an apocalyptic number.

665723070 is an abundant number, since it is smaller than the sum of its proper divisors (1109539170).

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

665723070 is a wasteful number, since it uses less digits than its factorization.

665723070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465657 (or 2465651 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 665723070 is about 25801.6098334968. The cubic root of 665723070 is about 873.1681163225.

The spelling of 665723070 in words is "six hundred sixty-five million, seven hundred twenty-three thousand, seventy".