185857204397 has 2 divisors, whose sum is σ = 185857204398. Its totient is φ = 185857204396.

The previous prime is 185857204369. The next prime is 185857204453. The reversal of 185857204397 is 793402758581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95721553321 + 90135651076 = 309389^2 + 300226^2 .

It is a cyclic number.

It is not a de Polignac number, because 185857204397 - 2²² = 185853010093 is a prime.

It is a super-2 number, since 2×185857204397² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185857204327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92928602198 + 92928602199.

It is an arithmetic number, because the mean of its divisors is an integer number (92928602199).

Almost surely, 2^185857204397 is an apocalyptic number.

It is an amenable number.

185857204397 is a deficient number, since it is larger than the sum of its proper divisors (1).

185857204397 is an equidigital number, since it uses as much as digits as its factorization.

185857204397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 185857204397 in words is "one hundred eighty-five billion, eight hundred fifty-seven million, two hundred four thousand, three hundred ninety-seven".