572697661 has 4 divisors (see below), whose sum is σ = 572800924. Its totient is φ = 572594400.

The previous prime is 572697659. The next prime is 572697721. The reversal of 572697661 is 166796275.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 476068761 + 96628900 = 21819^2 + 9830^2 .

It is a cyclic number.

It is not a de Polignac number, because 572697661 - 2¹ = 572697659 is a prime.

It is a super-2 number, since 2×572697661² = 655965221829741842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (572697611) 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 3 ways as a sum of consecutive naturals, for example, 42810 + ... + 54571.

It is an arithmetic number, because the mean of its divisors is an integer number (143200231).

Almost surely, 2^572697661 is an apocalyptic number.

It is an amenable number.

572697661 is a deficient number, since it is larger than the sum of its proper divisors (103263).

572697661 is an equidigital number, since it uses as much as digits as its factorization.

572697661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103262.

The product of its digits is 952560, while the sum is 49.

The square root of 572697661 is about 23931.1023774501. The cubic root of 572697661 is about 830.4404015920.

The spelling of 572697661 in words is "five hundred seventy-two million, six hundred ninety-seven thousand, six hundred sixty-one".