18772561446 has 16 divisors (see below), whose sum is σ = 37563346944. Its totient is φ = 6254483144.

The previous prime is 18772561441. The next prime is 18772561481. The reversal of 18772561446 is 64416527781.

It is a super-2 number, since 2×18772561446² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772561441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745926 + ... + 770681.

It is an arithmetic number, because the mean of its divisors is an integer number (2347709184).

Almost surely, 2^18772561446 is an apocalyptic number.

18772561446 is an abundant number, since it is smaller than the sum of its proper divisors (18790785498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18772561446 is a wasteful number, since it uses less digits than its factorization.

18772561446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1518675.

The product of its digits is 2257920, while the sum is 51.

The spelling of 18772561446 in words is "eighteen billion, seven hundred seventy-two million, five hundred sixty-one thousand, four hundred forty-six".