660279899891 has 2 divisors, whose sum is σ = 660279899892. Its totient is φ = 660279899890.

The previous prime is 660279899857. The next prime is 660279899897. The reversal of 660279899891 is 198998972066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660279899891 - 2²² = 660275705587 is a prime.

It is not a weakly prime, because it can be changed into another prime (660279899897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330139949945 + 330139949946.

It is an arithmetic number, because the mean of its divisors is an integer number (330139949946).

Almost surely, 2^660279899891 is an apocalyptic number.

660279899891 is a deficient number, since it is larger than the sum of its proper divisors (1).

660279899891 is an equidigital number, since it uses as much as digits as its factorization.

660279899891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211631616, while the sum is 74.

The spelling of 660279899891 in words is "six hundred sixty billion, two hundred seventy-nine million, eight hundred ninety-nine thousand, eight hundred ninety-one".