18632688064642 has 4 divisors (see below), whose sum is σ = 27949032096966. Its totient is φ = 9316344032320.

The previous prime is 18632688064631. The next prime is 18632688064643. The reversal of 18632688064642 is 24646088623681.

It is a happy number.

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., 15519337212681 + 3113350851961 = 3939459^2 + 1764469^2 .

It is not an unprimeable number, because it can be changed into a prime (18632688064643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4658172016159 + ... + 4658172016162.

Almost surely, 2^{18632688064642} is an apocalyptic number.

18632688064642 is a deficient number, since it is larger than the sum of its proper divisors (9316344032324).

18632688064642 is an equidigital number, since it uses as much as digits as its factorization.

18632688064642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316344032323.

The product of its (nonzero) digits is 127401984, while the sum is 64.

The spelling of 18632688064642 in words is "eighteen trillion, six hundred thirty-two billion, six hundred eighty-eight million, sixty-four thousand, six hundred forty-two".