1661366112 has 96 divisors (see below), whose sum is σ = 5000954112. Its totient is φ = 473071104.

The previous prime is 1661366111. The next prime is 1661366141. The reversal of 1661366112 is 2116631661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661366111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202278 + ... + 210330.

It is an arithmetic number, because the mean of its divisors is an integer number (52093272).

Almost surely, 2^1661366112 is an apocalyptic number.

1661366112 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 1661366112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2500477056).

1661366112 is an abundant number, since it is smaller than the sum of its proper divisors (3339588000).

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

1661366112 is a wasteful number, since it uses less digits than its factorization.

1661366112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8380 (or 8372 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 1661366112 is about 40759.8590772834. The cubic root of 1661366112 is about 1184.3728661899.

Adding to 1661366112 its reverse (2116631661), we get a palindrome (3777997773).

The spelling of 1661366112 in words is "one billion, six hundred sixty-one million, three hundred sixty-six thousand, one hundred twelve".