1566649873920 has 160 divisors (see below), whose sum is σ = 5009821850880. Its totient is φ = 417653350400.

The previous prime is 1566649873903. The next prime is 1566649873981. The reversal of 1566649873920 is 293789466651.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28534495 + ... + 28589345.

It is an arithmetic number, because the mean of its divisors is an integer number (31311386568).

It is a 1-persistent number, because it is pandigital, but 2⋅1566649873920 = 3133299747840 is not.

Almost surely, 2^{1566649873920} is an apocalyptic number.

1566649873920 is a gapful number since it is divisible by the number (10) 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 1566649873920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2504910925440).

1566649873920 is an abundant number, since it is smaller than the sum of its proper divisors (3443171976960).

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

1566649873920 is an equidigital number, since it uses as much as digits as its factorization.

1566649873920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58596 (or 58580 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 66.

The spelling of 1566649873920 in words is "one trillion, five hundred sixty-six billion, six hundred forty-nine million, eight hundred seventy-three thousand, nine hundred twenty".