18771956136 has 48 divisors (see below), whose sum is σ = 50925425460. Its totient is φ = 6246892800.

The previous prime is 18771956131. The next prime is 18771956171. The reversal of 18771956136 is 63165917781.

18771956136 is a `hidden beast` number, since 1 + 8 + 7 + 7 + 19 + 5 + 613 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17132192100 + 1639764036 = 130890^2 + 40494^2 .

It is not an unprimeable number, because it can be changed into a prime (18771956131) 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 11 ways as a sum of consecutive naturals, for example, 173635 + ... + 260178.

Almost surely, 2^18771956136 is an apocalyptic number.

It is an amenable number.

18771956136 is an abundant number, since it is smaller than the sum of its proper divisors (32153469324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18771956136 is a wasteful number, since it uses less digits than its factorization.

18771956136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434426 (or 434419 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 18771956136 in words is "eighteen billion, seven hundred seventy-one million, nine hundred fifty-six thousand, one hundred thirty-six".