18773772885 has 48 divisors (see below), whose sum is σ = 38806919424. Its totient is φ = 8209149696.

The previous prime is 18773772881. The next prime is 18773772893. The reversal of 18773772885 is 58827737781.

18773772885 is a `hidden beast` number, since 187 + 7 + 377 + 2 + 8 + 85 = 666.

It is not a de Polignac number, because 18773772885 - 2² = 18773772881 is a prime.

It is a super-2 number, since 2×18773772885² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18773772881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1288392 + ... + 1302881.

It is an arithmetic number, because the mean of its divisors is an integer number (808477488).

Almost surely, 2^18773772885 is an apocalyptic number.

18773772885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18773772885 is an abundant number, since it is smaller than the sum of its proper divisors (20033146539).

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

18773772885 is a wasteful number, since it uses less digits than its factorization.

18773772885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591314 (or 2591311 counting only the distinct ones).

The product of its digits is 36879360, while the sum is 63.

The spelling of 18773772885 in words is "eighteen billion, seven hundred seventy-three million, seven hundred seventy-two thousand, eight hundred eighty-five".