2778065694 has 16 divisors (see below), whose sum is σ = 6173479440. Its totient is φ = 926021880.

The previous prime is 2778065687. The next prime is 2778065699. The reversal of 2778065694 is 4965608772.

2778065694 is a `hidden beast` number, since 2 + 7 + 78 + 0 + 6 + 569 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 51445661 = 2778065694 / (2 + 7 + 7 + 8 + 0 + 6 + 5 + 6 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 2778065694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778065699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25722777 + ... + 25722884.

It is an arithmetic number, because the mean of its divisors is an integer number (385842465).

Almost surely, 2^2778065694 is an apocalyptic number.

2778065694 is an abundant number, since it is smaller than the sum of its proper divisors (3395413746).

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

2778065694 is a wasteful number, since it uses less digits than its factorization.

2778065694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51445672 (or 51445666 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The square root of 2778065694 is about 52707.3590118116. The cubic root of 2778065694 is about 1405.7696747477.

The spelling of 2778065694 in words is "two billion, seven hundred seventy-eight million, sixty-five thousand, six hundred ninety-four".