1666572443580 has 288 divisors, whose sum is σ = 5482758564864. Its totient is φ = 377024384000.

The previous prime is 1666572443521. The next prime is 1666572443581. The reversal of 1666572443580 is 853442756661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666572443580.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666572443581) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6724465 + ... + 6967895.

It is an arithmetic number, because the mean of its divisors is an integer number (19037356128).

Almost surely, 2^{1666572443580} is an apocalyptic number.

1666572443580 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 1666572443580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2741379282432).

1666572443580 is an abundant number, since it is smaller than the sum of its proper divisors (3816186121284).

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

1666572443580 is a wasteful number, since it uses less digits than its factorization.

1666572443580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243529 (or 243516 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 57.

The spelling of 1666572443580 in words is "one trillion, six hundred sixty-six billion, five hundred seventy-two million, four hundred forty-three thousand, five hundred eighty".