1561601501211 has 16 divisors (see below), whose sum is σ = 2111514283008. Its totient is φ = 1026378931200.

The previous prime is 1561601501203. The next prime is 1561601501219. The reversal of 1561601501211 is 1121051061651.

It is an interprime number because it is at equal distance from previous prime (1561601501203) and next prime (1561601501219).

It is not a de Polignac number, because 1561601501211 - 2³ = 1561601501203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561601501219) 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, 12297435 + ... + 12423771.

It is an arithmetic number, because the mean of its divisors is an integer number (131969642688).

Almost surely, 2^{1561601501211} is an apocalyptic number.

1561601501211 is a deficient number, since it is larger than the sum of its proper divisors (549912781797).

1561601501211 is a wasteful number, since it uses less digits than its factorization.

1561601501211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184442.

The product of its (nonzero) digits is 1800, while the sum is 30.

Adding to 1561601501211 its reverse (1121051061651), we get a palindrome (2682652562862).

The spelling of 1561601501211 in words is "one trillion, five hundred sixty-one billion, six hundred one million, five hundred one thousand, two hundred eleven".