18477131772 has 24 divisors (see below), whose sum is σ = 47032699392. Its totient is φ = 5599130800.

The previous prime is 18477131767. The next prime is 18477131773. The reversal of 18477131772 is 27713177481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18477131773) 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, 69989004 + ... + 69989267.

It is an arithmetic number, because the mean of its divisors is an integer number (1959695808).

Almost surely, 2^18477131772 is an apocalyptic number.

18477131772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18477131772 is an abundant number, since it is smaller than the sum of its proper divisors (28555567620).

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

18477131772 is a wasteful number, since it uses less digits than its factorization.

18477131772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139978289 (or 139978287 counting only the distinct ones).

The product of its digits is 460992, while the sum is 48.

The spelling of 18477131772 in words is "eighteen billion, four hundred seventy-seven million, one hundred thirty-one thousand, seven hundred seventy-two".