2556781178102 has 16 divisors (see below), whose sum is σ = 3930203576832. Its totient is φ = 1247083813800.

The previous prime is 2556781178101. The next prime is 2556781178117. The reversal of 2556781178102 is 2018711876552.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556781178101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92609774 + ... + 92637377.

It is an arithmetic number, because the mean of its divisors is an integer number (245637723552).

Almost surely, 2^{2556781178102} is an apocalyptic number.

2556781178102 is a deficient number, since it is larger than the sum of its proper divisors (1373422398730).

2556781178102 is a wasteful number, since it uses less digits than its factorization.

2556781178102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185247323.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 2556781178102 in words is "two trillion, five hundred fifty-six billion, seven hundred eighty-one million, one hundred seventy-eight thousand, one hundred two".