25595627021 has 2 divisors, whose sum is σ = 25595627022. Its totient is φ = 25595627020.

The previous prime is 25595627009. The next prime is 25595627039. The reversal of 25595627021 is 12072659552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21021810121 + 4573816900 = 144989^2 + 67630^2 .

It is a cyclic number.

It is not a de Polignac number, because 25595627021 - 2⁶ = 25595626957 is a prime.

It is a super-2 number, since 2×25595627021² (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 (25595627221) 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, 12797813510 + 12797813511.

It is an arithmetic number, because the mean of its divisors is an integer number (12797813511).

Almost surely, 2^25595627021 is an apocalyptic number.

It is an amenable number.

25595627021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25595627021 is an equidigital number, since it uses as much as digits as its factorization.

25595627021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 44.

The spelling of 25595627021 in words is "twenty-five billion, five hundred ninety-five million, six hundred twenty-seven thousand, twenty-one".