18366021247579 has 16 divisors (see below), whose sum is σ = 20132892334080. Its totient is φ = 16689107998080.

The previous prime is 18366021247573. The next prime is 18366021247591. The reversal of 18366021247579 is 97574212066381.

It is a cyclic number.

It is not a de Polignac number, because 18366021247579 - 2³⁷ = 18228582294107 is a prime.

It is a super-2 number, since 2×18366021247579² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18366021247573) 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, 137905567 + ... + 138038680.

It is an arithmetic number, because the mean of its divisors is an integer number (1258305770880).

It is a 2-persistent number, because it is pandigital, and so is 2⋅18366021247579 = 36732042495158, but 3⋅18366021247579 = 55098063742737 is not.

Almost surely, 2^{18366021247579} is an apocalyptic number.

18366021247579 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18366021247579 is a deficient number, since it is larger than the sum of its proper divisors (1766871086501).

18366021247579 is a wasteful number, since it uses less digits than its factorization.

18366021247579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275944410.

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 18366021247579 in words is "eighteen trillion, three hundred sixty-six billion, twenty-one million, two hundred forty-seven thousand, five hundred seventy-nine".