561371961916 has 6 divisors (see below), whose sum is σ = 982400933360. Its totient is φ = 280685980956.

The previous prime is 561371961907. The next prime is 561371961923. The reversal of 561371961916 is 619169173165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70171495236 + ... + 70171495243.

Almost surely, 2^561371961916 is an apocalyptic number.

It is an amenable number.

561371961916 is a deficient number, since it is larger than the sum of its proper divisors (421028971444).

561371961916 is a wasteful number, since it uses less digits than its factorization.

561371961916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140342990483 (or 140342990481 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 55.

The spelling of 561371961916 in words is "five hundred sixty-one billion, three hundred seventy-one million, nine hundred sixty-one thousand, nine hundred sixteen".