18579365981 has 16 divisors (see below), whose sum is σ = 20564627328. Its totient is φ = 16643726400.

The previous prime is 18579365963. The next prime is 18579366023. The reversal of 18579365981 is 18956397581.

It is a cyclic number.

It is not a de Polignac number, because 18579365981 - 2¹⁴ = 18579349597 is a prime.

It is a super-2 number, since 2×18579365981² (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 (18579365921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1835771 + ... + 1845863.

It is an arithmetic number, because the mean of its divisors is an integer number (1285289208).

Almost surely, 2^18579365981 is an apocalyptic number.

18579365981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18579365981 is a deficient number, since it is larger than the sum of its proper divisors (1985261347).

18579365981 is a wasteful number, since it uses less digits than its factorization.

18579365981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12532.

The product of its digits is 16329600, while the sum is 62.

The spelling of 18579365981 in words is "eighteen billion, five hundred seventy-nine million, three hundred sixty-five thousand, nine hundred eighty-one".