25121505571 has 2 divisors, whose sum is σ = 25121505572. Its totient is φ = 25121505570.

The previous prime is 25121505529. The next prime is 25121505583. The reversal of 25121505571 is 17550512152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25121505571 - 2¹⁹ = 25120981283 is a prime.

It is not a weakly prime, because it can be changed into another prime (25121505271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560752785 + 12560752786.

It is an arithmetic number, because the mean of its divisors is an integer number (12560752786).

Almost surely, 2^25121505571 is an apocalyptic number.

25121505571 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121505571 is an equidigital number, since it uses as much as digits as its factorization.

25121505571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17500, while the sum is 34.

The spelling of 25121505571 in words is "twenty-five billion, one hundred twenty-one million, five hundred five thousand, five hundred seventy-one".