2158939660 has 72 divisors (see below), whose sum is σ = 4662357840. Its totient is φ = 839684736.

The previous prime is 2158939649. The next prime is 2158939663. The reversal of 2158939660 is 669398512.

2158939660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2158939660² = 9322040911041831200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158939663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12479334 + ... + 12479506.

It is an arithmetic number, because the mean of its divisors is an integer number (64754970).

Almost surely, 2^2158939660 is an apocalyptic number.

2158939660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2158939660 is an abundant number, since it is smaller than the sum of its proper divisors (2503418180).

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

2158939660 is a wasteful number, since it uses less digits than its factorization.

2158939660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 2158939660 is about 46464.3913120575. The cubic root of 2158939660 is about 1292.4492577979.

The spelling of 2158939660 in words is "two billion, one hundred fifty-eight million, nine hundred thirty-nine thousand, six hundred sixty".