2783972221378 has 8 divisors (see below), whose sum is σ = 4179894205500. Its totient is φ = 1390674152880.

The previous prime is 2783972221363. The next prime is 2783972221391. The reversal of 2783972221378 is 8731222793872.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2736466967529 + 47505253849 = 1654227^2 + 217957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655976253 + ... + 655980496.

Almost surely, 2^{2783972221378} is an apocalyptic number.

2783972221378 is a deficient number, since it is larger than the sum of its proper divisors (1395921984122).

2783972221378 is a wasteful number, since it uses less digits than its factorization.

2783972221378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311957812.

The product of its digits is 28449792, while the sum is 61.

The spelling of 2783972221378 in words is "two trillion, seven hundred eighty-three billion, nine hundred seventy-two million, two hundred twenty-one thousand, three hundred seventy-eight".