561856686007 has 4 divisors (see below), whose sum is σ = 581231054520. Its totient is φ = 542482317496.

The previous prime is 561856685977. The next prime is 561856686071. The reversal of 561856686007 is 700686658165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561856686007 is a prime.

It is a super-2 number, since 2×561856686007² (a number of 24 digits) 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 (561856686077) 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 3 ways as a sum of consecutive naturals, for example, 9687184213 + ... + 9687184270.

It is an arithmetic number, because the mean of its divisors is an integer number (145307763630).

Almost surely, 2^561856686007 is an apocalyptic number.

561856686007 is a deficient number, since it is larger than the sum of its proper divisors (19374368513).

561856686007 is a wasteful number, since it uses less digits than its factorization.

561856686007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19374368512.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 561856686007 in words is "five hundred sixty-one billion, eight hundred fifty-six million, six hundred eighty-six thousand, seven".