2158778942 has 16 divisors (see below), whose sum is σ = 3380136480. Its totient is φ = 1032099552.

The previous prime is 2158778933. The next prime is 2158778953. The reversal of 2158778942 is 2498778512.

It is a congruent 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, 164288 + ... + 176940.

It is an arithmetic number, because the mean of its divisors is an integer number (211258530).

Almost surely, 2^2158778942 is an apocalyptic number.

2158778942 is a deficient number, since it is larger than the sum of its proper divisors (1221357538).

2158778942 is a wasteful number, since it uses less digits than its factorization.

2158778942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16387.

The product of its digits is 2257920, while the sum is 53.

The square root of 2158778942 is about 46462.6618049375. The cubic root of 2158778942 is about 1292.4171857244.

The spelling of 2158778942 in words is "two billion, one hundred fifty-eight million, seven hundred seventy-eight thousand, nine hundred forty-two".