185104135897 has 4 divisors (see below), whose sum is σ = 185141213620. Its totient is φ = 185067058176.

The previous prime is 185104135883. The next prime is 185104135933. The reversal of 185104135897 is 798531401581.

185104135897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798531401581 = 280591 ⋅2845891.

It can be written as a sum of positive squares in 2 ways, for example, as 25427172681 + 159676963216 = 159459^2 + 399596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185104135897 is a prime.

It is a super-2 number, since 2×185104135897² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (185104135807) 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 3 ways as a sum of consecutive naturals, for example, 18531372 + ... + 18541357.

It is an arithmetic number, because the mean of its divisors is an integer number (46285303405).

Almost surely, 2^185104135897 is an apocalyptic number.

It is an amenable number.

185104135897 is a deficient number, since it is larger than the sum of its proper divisors (37077723).

185104135897 is an equidigital number, since it uses as much as digits as its factorization.

185104135897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37077722.

The product of its (nonzero) digits is 1209600, while the sum is 52.

The spelling of 185104135897 in words is "one hundred eighty-five billion, one hundred four million, one hundred thirty-five thousand, eight hundred ninety-seven".