18944950481 has 4 divisors (see below), whose sum is σ = 18961821552. Its totient is φ = 18928079412.

The previous prime is 18944950459. The next prime is 18944950529. The reversal of 18944950481 is 18405944981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18405944981 = 373 ⋅49345697.

It is a cyclic number.

It is not a de Polignac number, because 18944950481 - 2²⁶ = 18877841617 is a prime.

It is a super-2 number, since 2×18944950481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18944950411) by changing a digit.

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, 8433851 + ... + 8436096.

It is an arithmetic number, because the mean of its divisors is an integer number (4740455388).

Almost surely, 2^18944950481 is an apocalyptic number.

It is an amenable number.

18944950481 is a deficient number, since it is larger than the sum of its proper divisors (16871071).

18944950481 is a wasteful number, since it uses less digits than its factorization.

18944950481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16871070.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 18944950481 in words is "eighteen billion, nine hundred forty-four million, nine hundred fifty thousand, four hundred eighty-one".