2158105538 has 16 divisors (see below), whose sum is σ = 3417666720. Its totient is φ = 1019221056.

The previous prime is 2158105531. The next prime is 2158105541. The reversal of 2158105538 is 8355018512.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2158105531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71456 + ... + 97067.

It is an arithmetic number, because the mean of its divisors is an integer number (213604170).

Almost surely, 2^2158105538 is an apocalyptic number.

2158105538 is a deficient number, since it is larger than the sum of its proper divisors (1259561182).

2158105538 is a wasteful number, since it uses less digits than its factorization.

2158105538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168881.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 2158105538 is about 46455.4145175780. The cubic root of 2158105538 is about 1292.2827873080.

The spelling of 2158105538 in words is "two billion, one hundred fifty-eight million, one hundred five thousand, five hundred thirty-eight".