18220966402 has 4 divisors (see below), whose sum is σ = 27331449606. Its totient is φ = 9110483200.

The previous prime is 18220966399. The next prime is 18220966403. The reversal of 18220966402 is 20466902281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15502491081 + 2718475321 = 124509^2 + 52139^2 .

It is not an unprimeable number, because it can be changed into a prime (18220966403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4555241599 + ... + 4555241602.

Almost surely, 2^18220966402 is an apocalyptic number.

18220966402 is a deficient number, since it is larger than the sum of its proper divisors (9110483204).

18220966402 is an equidigital number, since it uses as much as digits as its factorization.

18220966402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9110483203.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 18220966402 in words is "eighteen billion, two hundred twenty million, nine hundred sixty-six thousand, four hundred two".