561665037 has 16 divisors (see below), whose sum is σ = 806658048. Its totient is φ = 346608240.

The previous prime is 561665033. The next prime is 561665047. The reversal of 561665037 is 730566165.

It is not a de Polignac number, because 561665037 - 2² = 561665033 is a prime.

It is a super-2 number, since 2×561665037² = 630935227576422738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561664986 and 561665004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561665033) 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 15 ways as a sum of consecutive naturals, for example, 129153 + ... + 133430.

It is an arithmetic number, because the mean of its divisors is an integer number (50416128).

Almost surely, 2^561665037 is an apocalyptic number.

It is an amenable number.

561665037 is a deficient number, since it is larger than the sum of its proper divisors (244993011).

561665037 is a wasteful number, since it uses less digits than its factorization.

561665037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262640.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 561665037 is about 23699.4733485789. The cubic root of 561665037 is about 825.0731674318.

The spelling of 561665037 in words is "five hundred sixty-one million, six hundred sixty-five thousand, thirty-seven".