1666540031112 has 512 divisors, whose sum is σ = 5490076838400. Its totient is φ = 462657945600.

The previous prime is 1666540031063. The next prime is 1666540031159. The reversal of 1666540031112 is 2111300456661.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 982049848 + ... + 982051544.

It is an arithmetic number, because the mean of its divisors is an integer number (10722806325).

Almost surely, 2^{1666540031112} is an apocalyptic number.

1666540031112 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 1666540031112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2745038419200).

1666540031112 is an abundant number, since it is smaller than the sum of its proper divisors (3823536807288).

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

1666540031112 is a wasteful number, since it uses less digits than its factorization.

1666540031112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374 (or 2364 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 1666540031112 its reverse (2111300456661), we get a palindrome (3777840487773).

The spelling of 1666540031112 in words is "one trillion, six hundred sixty-six billion, five hundred forty million, thirty-one thousand, one hundred twelve".