18336973381 has 32 divisors (see below), whose sum is σ = 20263167360. Its totient is φ = 16525824000.

The previous prime is 18336973367. The next prime is 18336973409. The reversal of 18336973381 is 18337963381.

It is a cyclic number.

It is not a de Polignac number, because 18336973381 - 2⁷ = 18336973253 is a prime.

It is a super-2 number, since 2×18336973381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18336973181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6545181 + ... + 6547981.

It is an arithmetic number, because the mean of its divisors is an integer number (633223980).

Almost surely, 2^18336973381 is an apocalyptic number.

It is an amenable number.

18336973381 is a deficient number, since it is larger than the sum of its proper divisors (1926193979).

18336973381 is a wasteful number, since it uses less digits than its factorization.

18336973381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045.

The product of its digits is 1959552, while the sum is 52.

The spelling of 18336973381 in words is "eighteen billion, three hundred thirty-six million, nine hundred seventy-three thousand, three hundred eighty-one".