2781265052778 has 16 divisors (see below), whose sum is σ = 5889737759040. Its totient is φ = 872553742016.

The previous prime is 2781265052767. The next prime is 2781265052803. The reversal of 2781265052778 is 8772505621872.

It is a super-2 number, since 2×2781265052778² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 13633652118 + ... + 13633652321.

It is an arithmetic number, because the mean of its divisors is an integer number (368108609940).

Almost surely, 2^{2781265052778} is an apocalyptic number.

2781265052778 is an abundant number, since it is smaller than the sum of its proper divisors (3108472706262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2781265052778 is a wasteful number, since it uses less digits than its factorization.

2781265052778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27267304461.

The product of its (nonzero) digits is 26342400, while the sum is 60.

The spelling of 2781265052778 in words is "two trillion, seven hundred eighty-one billion, two hundred sixty-five million, fifty-two thousand, seven hundred seventy-eight".