561665426342446 has 16 divisors (see below), whose sum is σ = 847466171964000. Its totient is φ = 279179150266368.

The previous prime is 561665426342429. The next prime is 561665426342477. The reversal of 561665426342446 is 644243624566165.

It is a super-2 number, since 2×561665426342446² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611518411 + ... + 612436198.

It is an arithmetic number, because the mean of its divisors is an integer number (52966635747750).

Almost surely, 2^{561665426342446} is an apocalyptic number.

561665426342446 is a deficient number, since it is larger than the sum of its proper divisors (285800745621554).

561665426342446 is a wasteful number, since it uses less digits than its factorization.

561665426342446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223955963.

The product of its digits is 597196800, while the sum is 64.

The spelling of 561665426342446 in words is "five hundred sixty-one trillion, six hundred sixty-five billion, four hundred twenty-six million, three hundred forty-two thousand, four hundred forty-six".