660278863 has 2 divisors, whose sum is σ = 660278864. Its totient is φ = 660278862.

The previous prime is 660278819. The next prime is 660278891. The reversal of 660278863 is 368872066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660278863 - 2¹³ = 660270671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660276863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330139431 + 330139432.

It is an arithmetic number, because the mean of its divisors is an integer number (330139432).

Almost surely, 2^660278863 is an apocalyptic number.

660278863 is a deficient number, since it is larger than the sum of its proper divisors (1).

660278863 is an equidigital number, since it uses as much as digits as its factorization.

660278863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 660278863 is about 25695.8919479360. The cubic root of 660278863 is about 870.7813753442.

The spelling of 660278863 in words is "six hundred sixty million, two hundred seventy-eight thousand, eight hundred sixty-three".