18730815831 has 48 divisors (see below), whose sum is σ = 34747055616. Its totient is φ = 9450416448.

The previous prime is 18730815769. The next prime is 18730815833. The reversal of 18730815831 is 13851803781.

It is not a de Polignac number, because 18730815831 - 2⁶ = 18730815767 is a prime.

It is a super-2 number, since 2×18730815831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18730815833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 478345 + ... + 516018.

It is an arithmetic number, because the mean of its divisors is an integer number (723896992).

Almost surely, 2^18730815831 is an apocalyptic number.

18730815831 is a deficient number, since it is larger than the sum of its proper divisors (16016239785).

18730815831 is a wasteful number, since it uses less digits than its factorization.

18730815831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994412 (or 994409 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18730815831 in words is "eighteen billion, seven hundred thirty million, eight hundred fifteen thousand, eight hundred thirty-one".