2551855401 has 16 divisors (see below), whose sum is σ = 3979502400. Its totient is φ = 1611697824.

The previous prime is 2551855381. The next prime is 2551855409. The reversal of 2551855401 is 1045581552.

It is not a de Polignac number, because 2551855401 - 2⁶ = 2551855337 is a prime.

It is a super-2 number, since 2×2551855401² = 13023931975225741602, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2551855409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2486676 + ... + 2487701.

It is an arithmetic number, because the mean of its divisors is an integer number (248718900).

Almost surely, 2^2551855401 is an apocalyptic number.

It is an amenable number.

2551855401 is a deficient number, since it is larger than the sum of its proper divisors (1427646999).

2551855401 is a wasteful number, since it uses less digits than its factorization.

2551855401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974405 (or 4974399 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The square root of 2551855401 is about 50515.8925586790. The cubic root of 2551855401 is about 1366.5284798281.

The spelling of 2551855401 in words is "two billion, five hundred fifty-one million, eight hundred fifty-five thousand, four hundred one".