18854379081 has 36 divisors (see below), whose sum is σ = 28396107012. Its totient is φ = 12046377024.

The previous prime is 18854379059. The next prime is 18854379083. The reversal of 18854379081 is 18097345881.

18854379081 is a `hidden beast` number, since 1 + 8 + 8 + 543 + 7 + 90 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12897009225 + 5957369856 = 113565^2 + 77184^2 .

It is not a de Polignac number, because 18854379081 - 2¹⁰ = 18854378057 is a prime.

It is a super-2 number, since 2×18854379081² (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 (18854379083) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1488531 + ... + 1501143.

Almost surely, 2^18854379081 is an apocalyptic number.

It is an amenable number.

18854379081 is a deficient number, since it is larger than the sum of its proper divisors (9541727931).

18854379081 is a wasteful number, since it uses less digits than its factorization.

18854379081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12790 (or 12720 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 18854379081 in words is "eighteen billion, eight hundred fifty-four million, three hundred seventy-nine thousand, eighty-one".