25552641643 has 2 divisors, whose sum is σ = 25552641644. Its totient is φ = 25552641642.

The previous prime is 25552641613. The next prime is 25552641649. The reversal of 25552641643 is 34614625552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25552641643 - 2³³ = 16962707051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25552641643.

It is not a weakly prime, because it can be changed into another prime (25552641649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776320821 + 12776320822.

It is an arithmetic number, because the mean of its divisors is an integer number (12776320822).

Almost surely, 2^25552641643 is an apocalyptic number.

25552641643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25552641643 is an equidigital number, since it uses as much as digits as its factorization.

25552641643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864000, while the sum is 43.

The spelling of 25552641643 in words is "twenty-five billion, five hundred fifty-two million, six hundred forty-one thousand, six hundred forty-three".