12281991858 has 24 divisors (see below), whose sum is σ = 27767982528. Its totient is φ = 3915997272.

The previous prime is 12281991823. The next prime is 12281991859. The reversal of 12281991858 is 85819918221.

It is not an unprimeable number, because it can be changed into a prime (12281991859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14832910 + ... + 14833737.

It is an arithmetic number, because the mean of its divisors is an integer number (1156999272).

Almost surely, 2^12281991858 is an apocalyptic number.

12281991858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12281991858 is an abundant number, since it is smaller than the sum of its proper divisors (15485990670).

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

12281991858 is a wasteful number, since it uses less digits than its factorization.

12281991858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29666678 (or 29666675 counting only the distinct ones).

The product of its digits is 829440, while the sum is 54.

The spelling of 12281991858 in words is "twelve billion, two hundred eighty-one million, nine hundred ninety-one thousand, eight hundred fifty-eight".