2158778512 has 40 divisors (see below), whose sum is σ = 4598848512. Its totient is φ = 973526400.

The previous prime is 2158778509. The next prime is 2158778513.

2158778512 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (2158778513) 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, 25939 + ... + 70642.

Almost surely, 2^2158778512 is an apocalyptic number.

2158778512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2158778512 is an abundant number, since it is smaller than the sum of its proper divisors (2440070000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2158778512 is a wasteful number, since it uses less digits than its factorization.

2158778512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96727 (or 96721 counting only the distinct ones).

The product of its digits is 313600, while the sum is 46.

The square root of 2158778512 is about 46462.6571775657. The cubic root of 2158778512 is about 1292.4170999136.

The spelling of 2158778512 in words is "two billion, one hundred fifty-eight million, seven hundred seventy-eight thousand, five hundred twelve".