111620728565 has 16 divisors (see below), whose sum is σ = 141452535168. Its totient is φ = 84385029696.

The previous prime is 111620728501. The next prime is 111620728567. The reversal of 111620728565 is 565827026111.

It is a cyclic number.

It is not a de Polignac number, because 111620728565 - 2⁶ = 111620728501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111620728567) 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, 5837534 + ... + 5856623.

It is an arithmetic number, because the mean of its divisors is an integer number (8840783448).

Almost surely, 2^111620728565 is an apocalyptic number.

It is an amenable number.

111620728565 is a deficient number, since it is larger than the sum of its proper divisors (29831806603).

111620728565 is a wasteful number, since it uses less digits than its factorization.

111620728565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11694268.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 111620728565 in words is "one hundred eleven billion, six hundred twenty million, seven hundred twenty-eight thousand, five hundred sixty-five".