25151222561 has 2 divisors, whose sum is σ = 25151222562. Its totient is φ = 25151222560.

The previous prime is 25151222519. The next prime is 25151222587. The reversal of 25151222561 is 16522215152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21533801536 + 3617421025 = 146744^2 + 60145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25151222561 is a prime.

It is not a weakly prime, because it can be changed into another prime (25151222461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12575611280 + 12575611281.

It is an arithmetic number, because the mean of its divisors is an integer number (12575611281).

Almost surely, 2^25151222561 is an apocalyptic number.

It is an amenable number.

25151222561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25151222561 is an equidigital number, since it uses as much as digits as its factorization.

25151222561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 32.

The spelling of 25151222561 in words is "twenty-five billion, one hundred fifty-one million, two hundred twenty-two thousand, five hundred sixty-one".