1561032215609 has 2 divisors, whose sum is σ = 1561032215610. Its totient is φ = 1561032215608.

The previous prime is 1561032215573. The next prime is 1561032215627. The reversal of 1561032215609 is 9065122301651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413828012025 + 147204203584 = 1189045^2 + 383672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561032215609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561032212609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780516107804 + 780516107805.

It is an arithmetic number, because the mean of its divisors is an integer number (780516107805).

Almost surely, 2^{1561032215609} is an apocalyptic number.

It is an amenable number.

1561032215609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561032215609 is an equidigital number, since it uses as much as digits as its factorization.

1561032215609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 1561032215609 in words is "one trillion, five hundred sixty-one billion, thirty-two million, two hundred fifteen thousand, six hundred nine".