185657020109 has 16 divisors (see below), whose sum is σ = 213215369280. Its totient is φ = 159880469760.

The previous prime is 185657020067. The next prime is 185657020181. The reversal of 185657020109 is 901020756581.

185657020109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 185657020109 - 2²⁰ = 185655971533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 185657020109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185657020189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2461019 + ... + 2535335.

It is an arithmetic number, because the mean of its divisors is an integer number (13325960580).

Almost surely, 2^185657020109 is an apocalyptic number.

185657020109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

185657020109 is a deficient number, since it is larger than the sum of its proper divisors (27558349171).

185657020109 is a wasteful number, since it uses less digits than its factorization.

185657020109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86300.

The product of its (nonzero) digits is 151200, while the sum is 44.

The spelling of 185657020109 in words is "one hundred eighty-five billion, six hundred fifty-seven million, twenty thousand, one hundred nine".