18366703352021 has 4 divisors (see below), whose sum is σ = 18366711930732. Its totient is φ = 18366694773312.

The previous prime is 18366703351961. The next prime is 18366703352057. The reversal of 18366703352021 is 12025330766381.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2314749244900 + 16051954107121 = 1521430^2 + 4006489^2 .

It is a cyclic number.

It is not a de Polignac number, because 18366703352021 - 2⁴² = 13968656840917 is a prime.

It is a super-2 number, since 2×18366703352021² (a number of 27 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 (18366703357021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1876925 + ... + 6344781.

It is an arithmetic number, because the mean of its divisors is an integer number (4591677982683).

Almost surely, 2^{18366703352021} is an apocalyptic number.

It is an amenable number.

18366703352021 is a deficient number, since it is larger than the sum of its proper divisors (8578711).

18366703352021 is an equidigital number, since it uses as much as digits as its factorization.

18366703352021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8578710.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 18366703352021 in words is "eighteen trillion, three hundred sixty-six billion, seven hundred three million, three hundred fifty-two thousand, twenty-one".