660455397 has 32 divisors (see below), whose sum is σ = 1119605760. Its totient is φ = 376939440.

The previous prime is 660455363. The next prime is 660455407. The reversal of 660455397 is 793554066.

660455397 is a `hidden beast` number, since 6 + 6 + 0 + 4 + 553 + 97 = 666.

It is not a de Polignac number, because 660455397 - 2⁷ = 660455269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660455317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204598 + ... + 207800.

It is an arithmetic number, because the mean of its divisors is an integer number (34987680).

Almost surely, 2^660455397 is an apocalyptic number.

It is an amenable number.

660455397 is a deficient number, since it is larger than the sum of its proper divisors (459150363).

660455397 is a wasteful number, since it uses less digits than its factorization.

660455397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310 (or 4304 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The square root of 660455397 is about 25699.3267810657. The cubic root of 660455397 is about 870.8589732755.

It can be divided in two parts, 6604 and 55397, that added together give a square (62001 = 249²).

The spelling of 660455397 in words is "six hundred sixty million, four hundred fifty-five thousand, three hundred ninety-seven".