18931749076 has 12 divisors (see below), whose sum is σ = 33131649460. Its totient is φ = 9465563520.

The previous prime is 18931749071. The next prime is 18931749103. The reversal of 18931749076 is 67094713981.

It can be written as a sum of positive squares in 2 ways, for example, as 17088764176 + 1842984900 = 130724^2 + 42930^2 .

It is a super-2 number, since 2×18931749076² (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 (18931749071) 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, 109090 + ... + 223078.

Almost surely, 2^18931749076 is an apocalyptic number.

It is an amenable number.

18931749076 is a deficient number, since it is larger than the sum of its proper divisors (14199900384).

18931749076 is a wasteful number, since it uses less digits than its factorization.

18931749076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155514 (or 155512 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 18931749076 in words is "eighteen billion, nine hundred thirty-one million, seven hundred forty-nine thousand, seventy-six".