1659881045412 has 384 divisors, whose sum is σ = 4736212992000. Its totient is φ = 501240337920.

The previous prime is 1659881045401. The next prime is 1659881045437. The reversal of 1659881045412 is 2145401889561.

1659881045412 is a `hidden beast` number, since 1 + 6 + 5 + 9 + 88 + 10 + 4 + 541 + 2 = 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 127 ways as a sum of consecutive naturals, for example, 1318411639 + ... + 1318412897.

It is an arithmetic number, because the mean of its divisors is an integer number (12333888000).

Almost surely, 2^{1659881045412} is an apocalyptic number.

1659881045412 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 1659881045412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2368106496000).

1659881045412 is an abundant number, since it is smaller than the sum of its proper divisors (3076331946588).

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

1659881045412 is a wasteful number, since it uses less digits than its factorization.

1659881045412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1728 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 1659881045412 in words is "one trillion, six hundred fifty-nine billion, eight hundred eighty-one million, forty-five thousand, four hundred twelve".