259749703087921 has 2 divisors, whose sum is σ = 259749703087922. Its totient is φ = 259749703087920.

The previous prime is 259749703087873. The next prime is 259749703087957. The reversal of 259749703087921 is 129780307947952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225169952080896 + 34579751007025 = 15005664^2 + 5880455^2 .

It is a cyclic number.

It is not a de Polignac number, because 259749703087921 - 2²⁵ = 259749669533489 is a prime.

It is a super-2 number, since 2×259749703087921² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (259749703097921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129874851543960 + 129874851543961.

It is an arithmetic number, because the mean of its divisors is an integer number (129874851543961).

Almost surely, 2^{259749703087921} is an apocalyptic number.

It is an amenable number.

259749703087921 is a deficient number, since it is larger than the sum of its proper divisors (1).

259749703087921 is an equidigital number, since it uses as much as digits as its factorization.

259749703087921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480090240, while the sum is 73.

The spelling of 259749703087921 in words is "two hundred fifty-nine trillion, seven hundred forty-nine billion, seven hundred three million, eighty-seven thousand, nine hundred twenty-one".