561773645 has 16 divisors (see below), whose sum is σ = 698382000. Its totient is φ = 433294848.

The previous prime is 561773623. The next prime is 561773669. The reversal of 561773645 is 546377165.

It can be written as a sum of positive squares in 8 ways, for example, as 5851561 + 555922084 = 2419^2 + 23578^2 .

It is a cyclic number.

It is not a de Polignac number, because 561773645 - 2⁶ = 561773581 is a prime.

It is a super-3 number, since 3×561773645³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561773596 and 561773605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114911 + ... + 119699.

It is an arithmetic number, because the mean of its divisors is an integer number (43648875).

Almost surely, 2^561773645 is an apocalyptic number.

It is an amenable number.

561773645 is a deficient number, since it is larger than the sum of its proper divisors (136608355).

561773645 is a wasteful number, since it uses less digits than its factorization.

561773645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632.

The product of its digits is 529200, while the sum is 44.

The square root of 561773645 is about 23701.7645967552. The cubic root of 561773645 is about 825.1263448984.

The spelling of 561773645 in words is "five hundred sixty-one million, seven hundred seventy-three thousand, six hundred forty-five".