18315051381 has 72 divisors (see below), whose sum is σ = 29535414272. Its totient is φ = 10927224000.

The previous prime is 18315051367. The next prime is 18315051401.

18315051381 is a `hidden beast` number, since 1 + 83 + 150 + 51 + 381 = 666.

18315051381 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18315051381 - 2⁷ = 18315051253 is a prime.

It is a super-3 number, since 3×18315051381³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18315051581) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 20883315 + ... + 20884191.

Almost surely, 2^18315051381 is an apocalyptic number.

18315051381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18315051381 is a deficient number, since it is larger than the sum of its proper divisors (11220362891).

18315051381 is a wasteful number, since it uses less digits than its factorization.

18315051381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183 (or 1169 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 18315051381 in words is "eighteen billion, three hundred fifteen million, fifty-one thousand, three hundred eighty-one".