2155422478 has 16 divisors (see below), whose sum is σ = 3527940096. Its totient is φ = 979491640.

The previous prime is 2155422463. The next prime is 2155422499. The reversal of 2155422478 is 8742245512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155422478.

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, 100275 + ... + 119857.

It is an arithmetic number, because the mean of its divisors is an integer number (220496256).

Almost surely, 2^2155422478 is an apocalyptic number.

2155422478 is a deficient number, since it is larger than the sum of its proper divisors (1372517618).

2155422478 is a wasteful number, since it uses less digits than its factorization.

2155422478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24599.

The product of its digits is 179200, while the sum is 40.

The square root of 2155422478 is about 46426.5277400755. The cubic root of 2155422478 is about 1291.7470226323.

The spelling of 2155422478 in words is "two billion, one hundred fifty-five million, four hundred twenty-two thousand, four hundred seventy-eight".