660262387 has 2 divisors, whose sum is σ = 660262388. Its totient is φ = 660262386.

The previous prime is 660262381. The next prime is 660262391. The reversal of 660262387 is 783262066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660262387 - 2⁷ = 660262259 is a prime.

It is not a weakly prime, because it can be changed into another prime (660262381) 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, 330131193 + 330131194.

It is an arithmetic number, because the mean of its divisors is an integer number (330131194).

Almost surely, 2^660262387 is an apocalyptic number.

660262387 is a deficient number, since it is larger than the sum of its proper divisors (1).

660262387 is an equidigital number, since it uses as much as digits as its factorization.

660262387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 660262387 is about 25695.5713499428. The cubic root of 660262387 is about 870.7741323877.

The spelling of 660262387 in words is "six hundred sixty million, two hundred sixty-two thousand, three hundred eighty-seven".