660900397 has 2 divisors, whose sum is σ = 660900398. Its totient is φ = 660900396.

The previous prime is 660900391. The next prime is 660900419. The reversal of 660900397 is 793009066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 470846601 + 190053796 = 21699^2 + 13786^2 .

It is a cyclic number.

It is not a de Polignac number, because 660900397 - 2⁷ = 660900269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660900391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330450198 + 330450199.

It is an arithmetic number, because the mean of its divisors is an integer number (330450199).

Almost surely, 2^660900397 is an apocalyptic number.

It is an amenable number.

660900397 is a deficient number, since it is larger than the sum of its proper divisors (1).

660900397 is an equidigital number, since it uses as much as digits as its factorization.

660900397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 660900397 is about 25707.9831375392. The cubic root of 660900397 is about 871.0545177642.

The spelling of 660900397 in words is "six hundred sixty million, nine hundred thousand, three hundred ninety-seven".