1256553600555 has 32 divisors (see below), whose sum is σ = 2202357915648. Its totient is φ = 606710131200.

The previous prime is 1256553600521. The next prime is 1256553600559. The reversal of 1256553600555 is 5550063556521.

It is a happy number.

It is not a de Polignac number, because 1256553600555 - 2²³ = 1256545211947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256553600559) 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, 15759979 + ... + 15839508.

It is an arithmetic number, because the mean of its divisors is an integer number (68823684864).

Almost surely, 2^{1256553600555} is an apocalyptic number.

1256553600555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256553600555 is a deficient number, since it is larger than the sum of its proper divisors (945804315093).

1256553600555 is a wasteful number, since it uses less digits than its factorization.

1256553600555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31599747.

The product of its (nonzero) digits is 3375000, while the sum is 48.

The spelling of 1256553600555 in words is "one trillion, two hundred fifty-six billion, five hundred fifty-three million, six hundred thousand, five hundred fifty-five".