1561020205606 has 16 divisors (see below), whose sum is σ = 2443975698528. Its totient is φ = 746379409600.

The previous prime is 1561020205483. The next prime is 1561020205607. The reversal of 1561020205606 is 6065020201651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561020205607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4264855 + ... + 4616386.

It is an arithmetic number, because the mean of its divisors is an integer number (152748481158).

Almost surely, 2^{1561020205606} is an apocalyptic number.

1561020205606 is a deficient number, since it is larger than the sum of its proper divisors (882955492922).

1561020205606 is a wasteful number, since it uses less digits than its factorization.

1561020205606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8885087.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 1561020205606 in words is "one trillion, five hundred sixty-one billion, twenty million, two hundred five thousand, six hundred six".