561745172685 has 16 divisors (see below), whose sum is σ = 899032749120. Its totient is φ = 299517267840.

The previous prime is 561745172669. The next prime is 561745172789. The reversal of 561745172685 is 586271547165.

It is a happy number.

It is not a de Polignac number, because 561745172685 - 2⁴ = 561745172669 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4951896 + ... + 5064065.

It is an arithmetic number, because the mean of its divisors is an integer number (56189546820).

Almost surely, 2^561745172685 is an apocalyptic number.

It is an amenable number.

561745172685 is a deficient number, since it is larger than the sum of its proper divisors (337287576435).

561745172685 is a wasteful number, since it uses less digits than its factorization.

561745172685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019708.

The product of its digits is 14112000, while the sum is 57.

The spelling of 561745172685 in words is "five hundred sixty-one billion, seven hundred forty-five million, one hundred seventy-two thousand, six hundred eighty-five".