1601542566 has 72 divisors (see below), whose sum is σ = 3944172960. Its totient is φ = 466821792.

The previous prime is 1601542561. The next prime is 1601542573. The reversal of 1601542566 is 6652451061.

1601542566 is a `hidden beast` number, since 1 + 60 + 1 + 542 + 56 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1601542566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601542561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 74995 + ... + 93953.

It is an arithmetic number, because the mean of its divisors is an integer number (54780180).

Almost surely, 2^1601542566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1601542566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1972086480).

1601542566 is an abundant number, since it is smaller than the sum of its proper divisors (2342630394).

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

1601542566 is a wasteful number, since it uses less digits than its factorization.

1601542566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19018 (or 18996 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1601542566 is about 40019.2774297588. The cubic root of 1601542566 is about 1169.9828487514.

The spelling of 1601542566 in words is "one billion, six hundred one million, five hundred forty-two thousand, five hundred sixty-six".