2778402726178 has 16 divisors (see below), whose sum is σ = 4211540756640. Its totient is φ = 1374562417536.

The previous prime is 2778402726149. The next prime is 2778402726193. The reversal of 2778402726178 is 8716272048772.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808576 + ... + 2492107.

It is an arithmetic number, because the mean of its divisors is an integer number (263221297290).

Almost surely, 2^{2778402726178} is an apocalyptic number.

2778402726178 is a deficient number, since it is larger than the sum of its proper divisors (1433138030462).

2778402726178 is a wasteful number, since it uses less digits than its factorization.

2778402726178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305121.

The product of its (nonzero) digits is 29503488, while the sum is 61.

The spelling of 2778402726178 in words is "two trillion, seven hundred seventy-eight billion, four hundred two million, seven hundred twenty-six thousand, one hundred seventy-eight".