561660069 has 8 divisors (see below), whose sum is σ = 781440192. Its totient is φ = 358160000.

The previous prime is 561660061. The next prime is 561660089. The reversal of 561660069 is 960066165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561660069 - 2³ = 561660061 is a prime.

It is a super-2 number, since 2×561660069² = 630924066218169522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561660061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4069932 + ... + 4070069.

It is an arithmetic number, because the mean of its divisors is an integer number (97680024).

Almost surely, 2^561660069 is an apocalyptic number.

It is an amenable number.

561660069 is a deficient number, since it is larger than the sum of its proper divisors (219780123).

561660069 is a wasteful number, since it uses less digits than its factorization.

561660069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140027.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 561660069 is about 23699.3685358914. The cubic root of 561660069 is about 825.0707347983.

The spelling of 561660069 in words is "five hundred sixty-one million, six hundred sixty thousand, sixty-nine".