1566820887120 has 120 divisors (see below), whose sum is σ = 5273893996800. Its totient is φ = 416867067648.

The previous prime is 1566820887089. The next prime is 1566820887169. The reversal of 1566820887120 is 217880286651.

1566820887120 is a `hidden beast` number, since 1 + 566 + 8 + 2 + 0 + 8 + 8 + 71 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2162440 + ... + 2794599.

It is an arithmetic number, because the mean of its divisors is an integer number (43949116640).

Almost surely, 2^{1566820887120} is an apocalyptic number.

1566820887120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566820887120 is an abundant number, since it is smaller than the sum of its proper divisors (3707073109680).

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

1566820887120 is a wasteful number, since it uses less digits than its factorization.

1566820887120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4957497 (or 4957488 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 1566820887120 in words is "one trillion, five hundred sixty-six billion, eight hundred twenty million, eight hundred eighty-seven thousand, one hundred twenty".