1561933879759 has 16 divisors (see below), whose sum is σ = 1730718869760. Its totient is φ = 1397678688000.

The previous prime is 1561933879717. The next prime is 1561933879787. The reversal of 1561933879759 is 9579783391651.

It is a cyclic number.

It is not a de Polignac number, because 1561933879759 - 2⁷ = 1561933879631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561933879691 and 1561933879700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561933879799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1132002 + ... + 2098879.

It is an arithmetic number, because the mean of its divisors is an integer number (108169929360).

Almost surely, 2^{1561933879759} is an apocalyptic number.

1561933879759 is a deficient number, since it is larger than the sum of its proper divisors (168784990001).

1561933879759 is a wasteful number, since it uses less digits than its factorization.

1561933879759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231582.

The product of its digits is 385786800, while the sum is 73.

The spelling of 1561933879759 in words is "one trillion, five hundred sixty-one billion, nine hundred thirty-three million, eight hundred seventy-nine thousand, seven hundred fifty-nine".