561672778395 has 32 divisors (see below), whose sum is σ = 911162142720. Its totient is φ = 295406167680.

The previous prime is 561672778367. The next prime is 561672778427. The reversal of 561672778395 is 593877276165.

It is not a de Polignac number, because 561672778395 - 2⁷ = 561672778267 is a prime.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 31 ways as a sum of consecutive naturals, for example, 684222 + ... + 1261548.

It is an arithmetic number, because the mean of its divisors is an integer number (28473816960).

Almost surely, 2^561672778395 is an apocalyptic number.

561672778395 is a deficient number, since it is larger than the sum of its proper divisors (349489364325).

561672778395 is a wasteful number, since it uses less digits than its factorization.

561672778395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578235.

The product of its digits is 133358400, while the sum is 66.

The spelling of 561672778395 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-eight thousand, three hundred ninety-five".