20915060251 has 2 divisors, whose sum is σ = 20915060252. Its totient is φ = 20915060250.

The previous prime is 20915060249. The next prime is 20915060291. The reversal of 20915060251 is 15206051902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20915060251 - 2¹ = 20915060249 is a prime.

Together with 20915060249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20915060291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10457530125 + 10457530126.

It is an arithmetic number, because the mean of its divisors is an integer number (10457530126).

Almost surely, 2^20915060251 is an apocalyptic number.

20915060251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20915060251 is an equidigital number, since it uses as much as digits as its factorization.

20915060251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 20915060251 in words is "twenty billion, nine hundred fifteen million, sixty thousand, two hundred fifty-one".