25451515669 has 2 divisors, whose sum is σ = 25451515670. Its totient is φ = 25451515668.

The previous prime is 25451515633. The next prime is 25451515673. The reversal of 25451515669 is 96651515452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23989982769 + 1461532900 = 154887^2 + 38230^2 .

It is a cyclic number.

It is not a de Polignac number, because 25451515669 - 2²⁹ = 24914644757 is a prime.

It is a super-2 number, since 2×25451515669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25451515679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12725757834 + 12725757835.

It is an arithmetic number, because the mean of its divisors is an integer number (12725757835).

Almost surely, 2^25451515669 is an apocalyptic number.

It is an amenable number.

25451515669 is a deficient number, since it is larger than the sum of its proper divisors (1).

25451515669 is an equidigital number, since it uses as much as digits as its factorization.

25451515669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620000, while the sum is 49.

The spelling of 25451515669 in words is "twenty-five billion, four hundred fifty-one million, five hundred fifteen thousand, six hundred sixty-nine".