561672778386 has 32 divisors (see below), whose sum is σ = 1172290382208. Its totient is φ = 179068229120.

The previous prime is 561672778367. The next prime is 561672778427. The reversal of 561672778386 is 683877276165.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1437760 + ... + 1786196.

It is an arithmetic number, because the mean of its divisors is an integer number (36634074444).

Almost surely, 2^561672778386 is an apocalyptic number.

561672778386 is an abundant number, since it is smaller than the sum of its proper divisors (610617603822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561672778386 is a wasteful number, since it uses less digits than its factorization.

561672778386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360146.

The product of its digits is 142248960, while the sum is 66.

The spelling of 561672778386 in words is "five hundred sixty-one billion, six hundred seventy-two million, seven hundred seventy-eight thousand, three hundred eighty-six".