18031686741477 has 48 divisors (see below), whose sum is σ = 28278184399920. Its totient is φ = 11027233382400.

The previous prime is 18031686741473. The next prime is 18031686741527. The reversal of 18031686741477 is 77414768613081.

It is a happy number.

18031686741477 is a `hidden beast` number, since 1 + 8 + 0 + 3 + 1 + 68 + 67 + 41 + 477 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 23554268676 + 18008132472801 = 153474^2 + 4243599^2 .

It is not a de Polignac number, because 18031686741477 - 2² = 18031686741473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031686741473) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4997049 + ... + 7812417.

It is an arithmetic number, because the mean of its divisors is an integer number (589128841665).

Almost surely, 2^{18031686741477} is an apocalyptic number.

18031686741477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18031686741477 is a deficient number, since it is larger than the sum of its proper divisors (10246497658443).

18031686741477 is a wasteful number, since it uses less digits than its factorization.

18031686741477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816454 (or 2816451 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 63.

The spelling of 18031686741477 in words is "eighteen trillion, thirty-one billion, six hundred eighty-six million, seven hundred forty-one thousand, four hundred seventy-seven".