1881228681612 has 120 divisors (see below), whose sum is σ = 5625877537280. Its totient is φ = 536975917920.

The previous prime is 1881228681599. The next prime is 1881228681641. The reversal of 1881228681612 is 2161868221881.

1881228681612 is a `hidden beast` number, since 1 + 8 + 8 + 12 + 2 + 8 + 6 + 8 + 1 + 612 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1957287 + ... + 2755617.

Almost surely, 2^{1881228681612} is an apocalyptic number.

1881228681612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1881228681612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2812938768640).

1881228681612 is an abundant number, since it is smaller than the sum of its proper divisors (3744648855668).

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

1881228681612 is a wasteful number, since it uses less digits than its factorization.

1881228681612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799393 (or 799382 counting only the distinct ones).

The product of its digits is 1179648, while the sum is 54.

The spelling of 1881228681612 in words is "one trillion, eight hundred eighty-one billion, two hundred twenty-eight million, six hundred eighty-one thousand, six hundred twelve".