111866899501 has 48 divisors (see below), whose sum is σ = 140735024640. Its totient is φ = 88322357760.

The previous prime is 111866899489. The next prime is 111866899523. The reversal of 111866899501 is 105998668111.

It is a happy number.

It is not a de Polignac number, because 111866899501 - 2¹⁹ = 111866375213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111866899591) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19025280 + ... + 19031158.

It is an arithmetic number, because the mean of its divisors is an integer number (2931979680).

Almost surely, 2^111866899501 is an apocalyptic number.

It is an amenable number.

111866899501 is a deficient number, since it is larger than the sum of its proper divisors (28868125139).

111866899501 is a wasteful number, since it uses less digits than its factorization.

111866899501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6394 (or 6387 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 55.

The spelling of 111866899501 in words is "one hundred eleven billion, eight hundred sixty-six million, eight hundred ninety-nine thousand, five hundred one".