660587251 has 2 divisors, whose sum is σ = 660587252. Its totient is φ = 660587250.

The previous prime is 660587219. The next prime is 660587261. The reversal of 660587251 is 152785066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660587251 - 2⁵ = 660587219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660587261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330293625 + 330293626.

It is an arithmetic number, because the mean of its divisors is an integer number (330293626).

Almost surely, 2^660587251 is an apocalyptic number.

660587251 is a deficient number, since it is larger than the sum of its proper divisors (1).

660587251 is an equidigital number, since it uses as much as digits as its factorization.

660587251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 660587251 is about 25701.8919731603. The cubic root of 660587251 is about 870.9169224820.

The spelling of 660587251 in words is "six hundred sixty million, five hundred eighty-seven thousand, two hundred fifty-one".