10181581819 has 4 divisors (see below), whose sum is σ = 10456759744. Its totient is φ = 9906403896.

The previous prime is 10181581811. The next prime is 10181581859. The reversal of 10181581819 is 91818518101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10181581819 - 2³ = 10181581811 is a prime.

It is a super-2 number, since 2×10181581819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10181581811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137588907 + ... + 137588980.

It is an arithmetic number, because the mean of its divisors is an integer number (2614189936).

Almost surely, 2^10181581819 is an apocalyptic number.

10181581819 is a deficient number, since it is larger than the sum of its proper divisors (275177925).

10181581819 is an equidigital number, since it uses as much as digits as its factorization.

10181581819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275177924.

The product of its (nonzero) digits is 23040, while the sum is 43.

The spelling of 10181581819 in words is "ten billion, one hundred eighty-one million, five hundred eighty-one thousand, eight hundred nineteen".