111556401709 has 16 divisors (see below), whose sum is σ = 119365949808. Its totient is φ = 103885996032.

The previous prime is 111556401703. The next prime is 111556401779. The reversal of 111556401709 is 907104655111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1068636100 + 110487765609 = 32690^2 + 332397^2 .

It is a cyclic number.

It is not a de Polignac number, because 111556401709 - 2²¹ = 111554304557 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 (111556401703) 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, 10939317 + ... + 10949509.

It is an arithmetic number, because the mean of its divisors is an integer number (7460371863).

Almost surely, 2^111556401709 is an apocalyptic number.

It is an amenable number.

111556401709 is a deficient number, since it is larger than the sum of its proper divisors (7809548099).

111556401709 is a wasteful number, since it uses less digits than its factorization.

111556401709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16944.

The product of its (nonzero) digits is 37800, while the sum is 40.

The spelling of 111556401709 in words is "one hundred eleven billion, five hundred fifty-six million, four hundred one thousand, seven hundred nine".