2506121555 has 32 divisors (see below), whose sum is σ = 3737529216. Its totient is φ = 1573668864.

The previous prime is 2506121549. The next prime is 2506121557. The reversal of 2506121555 is 5551216052.

It is a cyclic number.

It is not a de Polignac number, because 2506121555 - 2⁴ = 2506121539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2506121557) 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 31 ways as a sum of consecutive naturals, for example, 34904 + ... + 78933.

It is an arithmetic number, because the mean of its divisors is an integer number (116797788).

Almost surely, 2^2506121555 is an apocalyptic number.

2506121555 is a deficient number, since it is larger than the sum of its proper divisors (1231407661).

2506121555 is a wasteful number, since it uses less digits than its factorization.

2506121555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113903.

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 2506121555 is about 50061.1781223734. The cubic root of 2506121555 is about 1358.3156691427.

The spelling of 2506121555 in words is "two billion, five hundred six million, one hundred twenty-one thousand, five hundred fifty-five".