25015521701 has 2 divisors, whose sum is σ = 25015521702. Its totient is φ = 25015521700.

The previous prime is 25015521679. The next prime is 25015521719. The reversal of 25015521701 is 10712551052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19664452900 + 5351068801 = 140230^2 + 73151^2 .

It is a cyclic number.

It is not a de Polignac number, because 25015521701 - 2⁶ = 25015521637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25015521731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12507760850 + 12507760851.

It is an arithmetic number, because the mean of its divisors is an integer number (12507760851).

Almost surely, 2^25015521701 is an apocalyptic number.

It is an amenable number.

25015521701 is a deficient number, since it is larger than the sum of its proper divisors (1).

25015521701 is an equidigital number, since it uses as much as digits as its factorization.

25015521701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3500, while the sum is 29.

The spelling of 25015521701 in words is "twenty-five billion, fifteen million, five hundred twenty-one thousand, seven hundred one".