111511555897 has 16 divisors (see below), whose sum is σ = 128217600000. Its totient is φ = 95001066000.

The previous prime is 111511555867. The next prime is 111511555949. The reversal of 111511555897 is 798555115111.

It is a cyclic number.

It is not a de Polignac number, because 111511555897 - 2¹⁵ = 111511523129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111511555897.

It is not an unprimeable number, because it can be changed into a prime (111511555817) 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 15 ways as a sum of consecutive naturals, for example, 775354 + ... + 907852.

It is an arithmetic number, because the mean of its divisors is an integer number (8013600000).

Almost surely, 2^111511555897 is an apocalyptic number.

It is an amenable number.

111511555897 is a deficient number, since it is larger than the sum of its proper divisors (16706044103).

111511555897 is a wasteful number, since it uses less digits than its factorization.

111511555897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133236.

The product of its digits is 315000, while the sum is 49.

The spelling of 111511555897 in words is "one hundred eleven billion, five hundred eleven million, five hundred fifty-five thousand, eight hundred ninety-seven".