18821945542 has 8 divisors (see below), whose sum is σ = 28238374800. Its totient is φ = 9409153944.

The previous prime is 18821945521. The next prime is 18821945561. The reversal of 18821945542 is 24554912881.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896442 + ... + 917197.

It is an arithmetic number, because the mean of its divisors is an integer number (3529796850).

Almost surely, 2^18821945542 is an apocalyptic number.

18821945542 is a deficient number, since it is larger than the sum of its proper divisors (9416429258).

18821945542 is a wasteful number, since it uses less digits than its factorization.

18821945542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818830.

The product of its digits is 921600, while the sum is 49.

The spelling of 18821945542 in words is "eighteen billion, eight hundred twenty-one million, nine hundred forty-five thousand, five hundred forty-two".