11538843588978 has 16 divisors (see below), whose sum is σ = 24435198188640. Its totient is φ = 3620029361216.

The previous prime is 11538843588929. The next prime is 11538843589037. The reversal of 11538843588978 is 87988534883511.

It is a happy number.

It is a super-2 number, since 2×11538843588978² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 56562958668 + ... + 56562958871.

It is an arithmetic number, because the mean of its divisors is an integer number (1527199886790).

Almost surely, 2^{11538843588978} is an apocalyptic number.

11538843588978 is an abundant number, since it is smaller than the sum of its proper divisors (12896354599662).

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

11538843588978 is a wasteful number, since it uses less digits than its factorization.

11538843588978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113125917561.

The product of its digits is 1857945600, while the sum is 78.

The spelling of 11538843588978 in words is "eleven trillion, five hundred thirty-eight billion, eight hundred forty-three million, five hundred eighty-eight thousand, nine hundred seventy-eight".