18420322773661 has 8 divisors (see below), whose sum is σ = 18570963538400. Its totient is φ = 18270219053520.

The previous prime is 18420322773649. The next prime is 18420322773739. The reversal of 18420322773661 is 16637722302481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18420322773661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18420322773599 and 18420322773608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420322773631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134192271 + ... + 134329468.

It is an arithmetic number, because the mean of its divisors is an integer number (2321370442300).

Almost surely, 2^{18420322773661} is an apocalyptic number.

It is an amenable number.

18420322773661 is a deficient number, since it is larger than the sum of its proper divisors (150640764739).

18420322773661 is a wasteful number, since it uses less digits than its factorization.

18420322773661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268522299.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 18420322773661 in words is "eighteen trillion, four hundred twenty billion, three hundred twenty-two million, seven hundred seventy-three thousand, six hundred sixty-one".