2778661334 has 4 divisors (see below), whose sum is σ = 4167992004. Its totient is φ = 1389330666.

The previous prime is 2778661243. The next prime is 2778661387. The reversal of 2778661334 is 4331668772.

2778661334 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694665332 + ... + 694665335.

It is an arithmetic number, because the mean of its divisors is an integer number (1041998001).

Almost surely, 2^2778661334 is an apocalyptic number.

2778661334 is a deficient number, since it is larger than the sum of its proper divisors (1389330670).

2778661334 is a wasteful number, since it uses less digits than its factorization.

2778661334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389330669.

The product of its digits is 1016064, while the sum is 47.

The square root of 2778661334 is about 52713.0091533390. The cubic root of 2778661334 is about 1405.8701370723.

The spelling of 2778661334 in words is "two billion, seven hundred seventy-eight million, six hundred sixty-one thousand, three hundred thirty-four".