11111981278040 has 32 divisors (see below), whose sum is σ = 25003918885680. Its totient is φ = 4444443887232.

The previous prime is 11111981278001. The next prime is 11111981278207. The reversal of 11111981278040 is 4087218911111.

It is a super-2 number, since 2×11111981278040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111981277982 and 11111981278000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10377842 + ... + 11398401.

Almost surely, 2^{11111981278040} is an apocalyptic number.

11111981278040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111981278040 is an abundant number, since it is smaller than the sum of its proper divisors (13891937607640).

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

11111981278040 is a wasteful number, since it uses less digits than its factorization.

11111981278040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21789011 (or 21789007 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 44.

The spelling of 11111981278040 in words is "eleven trillion, one hundred eleven billion, nine hundred eighty-one million, two hundred seventy-eight thousand, forty".