561516105677645 has 32 divisors (see below), whose sum is σ = 725862067568640. Its totient is φ = 415783890688320.

The previous prime is 561516105677581. The next prime is 561516105677689. The reversal of 561516105677645 is 546776501615165.

It is not a de Polignac number, because 561516105677645 - 2⁶ = 561516105677581 is a prime.

It is a super-3 number, since 3×561516105677645³ (a number of 45 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32724392 + ... + 46839278.

It is an arithmetic number, because the mean of its divisors is an integer number (22683189611520).

Almost surely, 2^{561516105677645} is an apocalyptic number.

It is an amenable number.

561516105677645 is a deficient number, since it is larger than the sum of its proper divisors (164345961890995).

561516105677645 is a wasteful number, since it uses less digits than its factorization.

561516105677645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14126105.

The product of its (nonzero) digits is 158760000, while the sum is 65.

The spelling of 561516105677645 in words is "five hundred sixty-one trillion, five hundred sixteen billion, one hundred five million, six hundred seventy-seven thousand, six hundred forty-five".