18223455642 has 96 divisors (see below), whose sum is σ = 43455734784. Its totient is φ = 5077144800.

The previous prime is 18223455641. The next prime is 18223455697. The reversal of 18223455642 is 24655432281.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 18223455594 and 18223455603.

It is not an unprimeable number, because it can be changed into a prime (18223455641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14803167 + ... + 14804397.

It is an arithmetic number, because the mean of its divisors is an integer number (452663904).

Almost surely, 2^18223455642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18223455642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21727867392).

18223455642 is an abundant number, since it is smaller than the sum of its proper divisors (25232279142).

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

18223455642 is a wasteful number, since it uses less digits than its factorization.

18223455642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464 (or 2457 counting only the distinct ones).

The product of its digits is 460800, while the sum is 42.

The spelling of 18223455642 in words is "eighteen billion, two hundred twenty-three million, four hundred fifty-five thousand, six hundred forty-two".