2158978459092 has 144 divisors (see below), whose sum is σ = 6253058068992. Its totient is φ = 567679432320.

The previous prime is 2158978459091. The next prime is 2158978459177. The reversal of 2158978459092 is 2909548798512.

It is a super-2 number, since 2×2158978459092² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158978459091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4469143 + ... + 4928609.

It is an arithmetic number, because the mean of its divisors is an integer number (43424014368).

Almost surely, 2^{2158978459092} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2158978459092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3126529034496).

2158978459092 is an abundant number, since it is smaller than the sum of its proper divisors (4094079609900).

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

2158978459092 is a wasteful number, since it uses less digits than its factorization.

2158978459092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459838 (or 459823 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 69.

The spelling of 2158978459092 in words is "two trillion, one hundred fifty-eight billion, nine hundred seventy-eight million, four hundred fifty-nine thousand, ninety-two".