2551555641 has 32 divisors (see below), whose sum is σ = 3521381760. Its totient is φ = 1642636800.

The previous prime is 2551555639. The next prime is 2551555651. The reversal of 2551555641 is 1465551552.

It is not a de Polignac number, because 2551555641 - 2¹ = 2551555639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2551555641.

It is not an unprimeable number, because it can be changed into a prime (2551555621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5196406 + ... + 5196896.

It is an arithmetic number, because the mean of its divisors is an integer number (110043180).

Almost surely, 2^2551555641 is an apocalyptic number.

It is an amenable number.

2551555641 is a deficient number, since it is larger than the sum of its proper divisors (969826119).

2551555641 is a wasteful number, since it uses less digits than its factorization.

2551555641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017.

The product of its digits is 150000, while the sum is 39.

The square root of 2551555641 is about 50512.9254844738. The cubic root of 2551555641 is about 1366.4749701847.

The spelling of 2551555641 in words is "two billion, five hundred fifty-one million, five hundred fifty-five thousand, six hundred forty-one".