10185835861 has 4 divisors (see below), whose sum is σ = 10434270924. Its totient is φ = 9937400800.

The previous prime is 10185835813. The next prime is 10185835873. The reversal of 10185835861 is 16853858101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16853858101 = 3853 ⋅4374217.

It can be written as a sum of positive squares in 2 ways, for example, as 5434490961 + 4751344900 = 73719^2 + 68930^2 .

It is a cyclic number.

It is not a de Polignac number, because 10185835861 - 2¹³ = 10185827669 is a prime.

It is a super-2 number, since 2×10185835861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10185835801) 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, 124217470 + ... + 124217551.

It is an arithmetic number, because the mean of its divisors is an integer number (2608567731).

Almost surely, 2^10185835861 is an apocalyptic number.

It is an amenable number.

10185835861 is a deficient number, since it is larger than the sum of its proper divisors (248435063).

10185835861 is an equidigital number, since it uses as much as digits as its factorization.

10185835861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248435062.

The product of its (nonzero) digits is 230400, while the sum is 46.

The spelling of 10185835861 in words is "ten billion, one hundred eighty-five million, eight hundred thirty-five thousand, eight hundred sixty-one".