18891552422 has 4 divisors (see below), whose sum is σ = 28337328636. Its totient is φ = 9445776210.

The previous prime is 18891552419. The next prime is 18891552437. The reversal of 18891552422 is 22425519881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22425519881 = 29 ⋅773293789.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4722888104 + ... + 4722888107.

It is an arithmetic number, because the mean of its divisors is an integer number (7084332159).

Almost surely, 2^18891552422 is an apocalyptic number.

18891552422 is a deficient number, since it is larger than the sum of its proper divisors (9445776214).

18891552422 is an equidigital number, since it uses as much as digits as its factorization.

18891552422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445776213.

The product of its digits is 460800, while the sum is 47.

The spelling of 18891552422 in words is "eighteen billion, eight hundred ninety-one million, five hundred fifty-two thousand, four hundred twenty-two".