25642447565629 has 2 divisors, whose sum is σ = 25642447565630. Its totient is φ = 25642447565628.

The previous prime is 25642447565599. The next prime is 25642447565633. The reversal of 25642447565629 is 92656574424652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23795879122404 + 1846568443225 = 4878102^2 + 1358885^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642447565629 - 2¹⁵ = 25642447532861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25642447565729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821223782814 + 12821223782815.

It is an arithmetic number, because the mean of its divisors is an integer number (12821223782815).

Almost surely, 2^{25642447565629} is an apocalyptic number.

It is an amenable number.

25642447565629 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642447565629 is an equidigital number, since it uses as much as digits as its factorization.

25642447565629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912000, while the sum is 67.

The spelling of 25642447565629 in words is "twenty-five trillion, six hundred forty-two billion, four hundred forty-seven million, five hundred sixty-five thousand, six hundred twenty-nine".