258116437721 has 2 divisors, whose sum is σ = 258116437722. Its totient is φ = 258116437720.

The previous prime is 258116437687. The next prime is 258116437723. The reversal of 258116437721 is 127734611852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141179796121 + 116936641600 = 375739^2 + 341960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258116437721 is a prime.

Together with 258116437723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (258116437723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129058218860 + 129058218861.

It is an arithmetic number, because the mean of its divisors is an integer number (129058218861).

Almost surely, 2^258116437721 is an apocalyptic number.

It is an amenable number.

258116437721 is a deficient number, since it is larger than the sum of its proper divisors (1).

258116437721 is an equidigital number, since it uses as much as digits as its factorization.

258116437721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 47.

The spelling of 258116437721 in words is "two hundred fifty-eight billion, one hundred sixteen million, four hundred thirty-seven thousand, seven hundred twenty-one".