561666610253040 has 160 divisors (see below), whose sum is σ = 1787009719415040. Its totient is φ = 145884495009792.

The previous prime is 561666610253029. The next prime is 561666610253041. The reversal of 561666610253040 is 40352016666165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561666610253041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194802114 + ... + 197664353.

It is an arithmetic number, because the mean of its divisors is an integer number (11168810746344).

Almost surely, 2^{561666610253040} is an apocalyptic number.

It is an amenable number.

561666610253040 is an abundant number, since it is smaller than the sum of its proper divisors (1225343109162000).

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

561666610253040 is a wasteful number, since it uses less digits than its factorization.

561666610253040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392466639 (or 392466633 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 561666610253040 in words is "five hundred sixty-one trillion, six hundred sixty-six billion, six hundred ten million, two hundred fifty-three thousand, forty".