251441968061 has 2 divisors, whose sum is σ = 251441968062. Its totient is φ = 251441968060.

The previous prime is 251441968031. The next prime is 251441968073. The reversal of 251441968061 is 160869144152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147931775161 + 103510192900 = 384619^2 + 321730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251441968061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251441967997 and 251441968015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251441968031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125720984030 + 125720984031.

It is an arithmetic number, because the mean of its divisors is an integer number (125720984031).

Almost surely, 2^251441968061 is an apocalyptic number.

It is an amenable number.

251441968061 is a deficient number, since it is larger than the sum of its proper divisors (1).

251441968061 is an equidigital number, since it uses as much as digits as its factorization.

251441968061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 251441968061 in words is "two hundred fifty-one billion, four hundred forty-one million, nine hundred sixty-eight thousand, sixty-one".