109858661639 has 16 divisors (see below), whose sum is σ = 113146357632. Its totient is φ = 106626487968.

The previous prime is 109858661609. The next prime is 109858661683. The reversal of 109858661639 is 936166858901.

It is a cyclic number.

It is not a de Polignac number, because 109858661639 - 2²⁸ = 109590226183 is a prime.

It is a super-2 number, since 2×109858661639² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109858661609) 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, 2047772 + ... + 2100734.

It is an arithmetic number, because the mean of its divisors is an integer number (7071647352).

Almost surely, 2^109858661639 is an apocalyptic number.

109858661639 is a deficient number, since it is larger than the sum of its proper divisors (3287695993).

109858661639 is an equidigital number, since it uses as much as digits as its factorization.

109858661639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53486.

The product of its (nonzero) digits is 16796160, while the sum is 62.

The spelling of 109858661639 in words is "one hundred nine billion, eight hundred fifty-eight million, six hundred sixty-one thousand, six hundred thirty-nine".