25290421693 has 2 divisors, whose sum is σ = 25290421694. Its totient is φ = 25290421692.

The previous prime is 25290421691. The next prime is 25290421699. The reversal of 25290421693 is 39612409252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18877935609 + 6412486084 = 137397^2 + 80078^2 .

It is a cyclic number.

It is not a de Polignac number, because 25290421693 - 2¹ = 25290421691 is a prime.

Together with 25290421691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25290421691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12645210846 + 12645210847.

It is an arithmetic number, because the mean of its divisors is an integer number (12645210847).

Almost surely, 2^25290421693 is an apocalyptic number.

It is an amenable number.

25290421693 is a deficient number, since it is larger than the sum of its proper divisors (1).

25290421693 is an equidigital number, since it uses as much as digits as its factorization.

25290421693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 25290421693 in words is "twenty-five billion, two hundred ninety million, four hundred twenty-one thousand, six hundred ninety-three".