258844952981 has 4 divisors (see below), whose sum is σ = 259661498892. Its totient is φ = 258028407072.

The previous prime is 258844952959. The next prime is 258844953011. The reversal of 258844952981 is 189259448852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106514765956 + 152330187025 = 326366^2 + 390295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258844952981 is a prime.

It is a super-2 number, since 2×258844952981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258844952941) 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 in 3 ways as a sum of consecutive naturals, for example, 408272480 + ... + 408273113.

It is an arithmetic number, because the mean of its divisors is an integer number (64915374723).

Almost surely, 2^258844952981 is an apocalyptic number.

It is an amenable number.

258844952981 is a deficient number, since it is larger than the sum of its proper divisors (816545911).

258844952981 is an equidigital number, since it uses as much as digits as its factorization.

258844952981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816545910.

The product of its digits is 66355200, while the sum is 65.

The spelling of 258844952981 in words is "two hundred fifty-eight billion, eight hundred forty-four million, nine hundred fifty-two thousand, nine hundred eighty-one".