18402278402 has 4 divisors (see below), whose sum is σ = 27603417606. Its totient is φ = 9201139200.

The previous prime is 18402278383. The next prime is 18402278413. The reversal of 18402278402 is 20487220481.

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., 18330181321 + 72097081 = 135389^2 + 8491^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4600569599 + ... + 4600569602.

Almost surely, 2^18402278402 is an apocalyptic number.

18402278402 is a deficient number, since it is larger than the sum of its proper divisors (9201139204).

18402278402 is an equidigital number, since it uses as much as digits as its factorization.

18402278402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9201139203.

The product of its (nonzero) digits is 57344, while the sum is 38.

Adding to 18402278402 its reverse (20487220481), we get a palindrome (38889498883).

The spelling of 18402278402 in words is "eighteen billion, four hundred two million, two hundred seventy-eight thousand, four hundred two".