25551601291 has 2 divisors, whose sum is σ = 25551601292. Its totient is φ = 25551601290.

The previous prime is 25551601237. The next prime is 25551601333. The reversal of 25551601291 is 19210615552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25551601291 - 2⁹ = 25551600779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25551601291.

It is not a weakly prime, because it can be changed into another prime (25551611291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775800645 + 12775800646.

It is an arithmetic number, because the mean of its divisors is an integer number (12775800646).

Almost surely, 2^25551601291 is an apocalyptic number.

25551601291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551601291 is an equidigital number, since it uses as much as digits as its factorization.

25551601291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 25551601291 in words is "twenty-five billion, five hundred fifty-one million, six hundred one thousand, two hundred ninety-one".