572561661 has 32 divisors (see below), whose sum is σ = 919830528. Its totient is φ = 309870720.

The previous prime is 572561659. The next prime is 572561663. The reversal of 572561661 is 166165275.

It is an interprime number because it is at equal distance from previous prime (572561659) and next prime (572561663).

It is not a de Polignac number, because 572561661 - 2¹ = 572561659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (572561663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21241 + ... + 39953.

It is an arithmetic number, because the mean of its divisors is an integer number (28744704).

Almost surely, 2^572561661 is an apocalyptic number.

It is an amenable number.

572561661 is a deficient number, since it is larger than the sum of its proper divisors (347268867).

572561661 is a wasteful number, since it uses less digits than its factorization.

572561661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18801.

The product of its digits is 75600, while the sum is 39.

The square root of 572561661 is about 23928.2607182386. The cubic root of 572561661 is about 830.3746607753.

The spelling of 572561661 in words is "five hundred seventy-two million, five hundred sixty-one thousand, six hundred sixty-one".