18821945541 has 16 divisors (see below), whose sum is σ = 28682976384. Its totient is φ = 10754678784.

The previous prime is 18821945521. The next prime is 18821945561. The reversal of 18821945541 is 14554912881.

It is an interprime number because it is at equal distance from previous prime (18821945521) and next prime (18821945561).

It is not a de Polignac number, because 18821945541 - 2⁶ = 18821945477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821945521) 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 15 ways as a sum of consecutive naturals, for example, 599941 + ... + 630533.

It is an arithmetic number, because the mean of its divisors is an integer number (1792686024).

Almost surely, 2^18821945541 is an apocalyptic number.

It is an amenable number.

18821945541 is a deficient number, since it is larger than the sum of its proper divisors (9861030843).

18821945541 is a wasteful number, since it uses less digits than its factorization.

18821945541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59900.

The product of its digits is 460800, while the sum is 48.

The spelling of 18821945541 in words is "eighteen billion, eight hundred twenty-one million, nine hundred forty-five thousand, five hundred forty-one".