111551115120 has 80 divisors (see below), whose sum is σ = 346309418112. Its totient is φ = 29703870720.

The previous prime is 111551115119. The next prime is 111551115121. The reversal of 111551115120 is 21511155111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111551115119) and next prime (111551115121).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×111551115120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111551115121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170482 + ... + 502161.

Almost surely, 2^111551115120 is an apocalyptic number.

111551115120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111551115120 is an abundant number, since it is smaller than the sum of its proper divisors (234758302992).

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

111551115120 is a wasteful number, since it uses less digits than its factorization.

111551115120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673350 (or 673344 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 24.

The spelling of 111551115120 in words is "one hundred eleven billion, five hundred fifty-one million, one hundred fifteen thousand, one hundred twenty".