25555050551 has 4 divisors (see below), whose sum is σ = 25556495400. Its totient is φ = 25553605704.

The previous prime is 25555050541. The next prime is 25555050557. The reversal of 25555050551 is 15505055552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25555050551 - 2⁶ = 25555050487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555050557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695561 + ... + 731378.

It is an arithmetic number, because the mean of its divisors is an integer number (6389123850).

Almost surely, 2^25555050551 is an apocalyptic number.

25555050551 is a deficient number, since it is larger than the sum of its proper divisors (1444849).

25555050551 is a wasteful number, since it uses less digits than its factorization.

25555050551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444848.

The product of its (nonzero) digits is 156250, while the sum is 38.

The spelling of 25555050551 in words is "twenty-five billion, five hundred fifty-five million, fifty thousand, five hundred fifty-one".