25655178551 has 2 divisors, whose sum is σ = 25655178552. Its totient is φ = 25655178550.

The previous prime is 25655178487. The next prime is 25655178589. The reversal of 25655178551 is 15587155652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25655178551 - 2⁶ = 25655178487 is a prime.

It is a super-3 number, since 3×25655178551³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25655178551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25655172551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12827589275 + 12827589276.

It is an arithmetic number, because the mean of its divisors is an integer number (12827589276).

Almost surely, 2^25655178551 is an apocalyptic number.

25655178551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25655178551 is an equidigital number, since it uses as much as digits as its factorization.

25655178551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100000, while the sum is 50.

The spelling of 25655178551 in words is "twenty-five billion, six hundred fifty-five million, one hundred seventy-eight thousand, five hundred fifty-one".