2115369778158 has 288 divisors, whose sum is σ = 5969846937600. Its totient is φ = 527086175616.

The previous prime is 2115369778157. The next prime is 2115369778189. The reversal of 2115369778158 is 8518779635112.

It is a happy number.

2115369778158 is a `hidden beast` number, since 2 + 1 + 1 + 536 + 97 + 7 + 8 + 1 + 5 + 8 = 666.

It is a super-2 number, since 2×2115369778158² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 2115369778095 and 2115369778104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115369778157) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 224104803 + ... + 224114241.

It is an arithmetic number, because the mean of its divisors is an integer number (20728635200).

Almost surely, 2^{2115369778158} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115369778158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2984923468800).

2115369778158 is an abundant number, since it is smaller than the sum of its proper divisors (3854477159442).

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

2115369778158 is a wasteful number, since it uses less digits than its factorization.

2115369778158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9884 (or 9862 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 63.

The spelling of 2115369778158 in words is "two trillion, one hundred fifteen billion, three hundred sixty-nine million, seven hundred seventy-eight thousand, one hundred fifty-eight".