18369978341766 has 16 divisors (see below), whose sum is σ = 36741245378544. Its totient is φ = 6123111331424.

The previous prime is 18369978341747. The next prime is 18369978341797. The reversal of 18369978341766 is 66714387996381.

It is a super-2 number, since 2×18369978341766² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18369978341691 and 18369978341700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53510265 + ... + 53852468.

It is an arithmetic number, because the mean of its divisors is an integer number (2296327836159).

Almost surely, 2^{18369978341766} is an apocalyptic number.

18369978341766 is an abundant number, since it is smaller than the sum of its proper divisors (18371267036778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18369978341766 is a wasteful number, since it uses less digits than its factorization.

18369978341766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107391255.

The product of its digits is 1975228416, while the sum is 78.

The spelling of 18369978341766 in words is "eighteen trillion, three hundred sixty-nine billion, nine hundred seventy-eight million, three hundred forty-one thousand, seven hundred sixty-six".