2158178404 has 6 divisors (see below), whose sum is σ = 3776812214. Its totient is φ = 1079089200.

The previous prime is 2158178369. The next prime is 2158178411. The reversal of 2158178404 is 4048718512.

It can be written as a sum of positive squares in only one way, i.e., 1343075904 + 815102500 = 36648^2 + 28550^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269772297 + ... + 269772304.

Almost surely, 2^2158178404 is an apocalyptic number.

It is an amenable number.

2158178404 is a deficient number, since it is larger than the sum of its proper divisors (1618633810).

2158178404 is a wasteful number, since it uses less digits than its factorization.

2158178404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539544605 (or 539544603 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 2158178404 is about 46456.1987683022. The cubic root of 2158178404 is about 1292.2973313014.

The spelling of 2158178404 in words is "two billion, one hundred fifty-eight million, one hundred seventy-eight thousand, four hundred four".