1666656364632 has 128 divisors (see below), whose sum is σ = 4826590156800. Its totient is φ = 469727152128.

The previous prime is 1666656364621. The next prime is 1666656364657. The reversal of 1666656364632 is 2364636566661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14502148 + ... + 14616620.

It is an arithmetic number, because the mean of its divisors is an integer number (37707735600).

Almost surely, 2^{1666656364632} is an apocalyptic number.

1666656364632 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 1666656364632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2413295078400).

1666656364632 is an abundant number, since it is smaller than the sum of its proper divisors (3159933792168).

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

1666656364632 is a wasteful number, since it uses less digits than its factorization.

1666656364632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115665 (or 115661 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 60.

The spelling of 1666656364632 in words is "one trillion, six hundred sixty-six billion, six hundred fifty-six million, three hundred sixty-four thousand, six hundred thirty-two".