2161636141505 has 4 divisors (see below), whose sum is σ = 2593963369812. Its totient is φ = 1729308913200.

The previous prime is 2161636141493. The next prime is 2161636141507. The reversal of 2161636141505 is 5051416361612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1546961325361 + 614674816144 = 1243769^2 + 784012^2 .

It is not a de Polignac number, because 2161636141505 - 2²⁸ = 2161367706049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161636141507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216163614146 + ... + 216163614155.

It is an arithmetic number, because the mean of its divisors is an integer number (648490842453).

Almost surely, 2^{2161636141505} is an apocalyptic number.

It is an amenable number.

2161636141505 is a deficient number, since it is larger than the sum of its proper divisors (432327228307).

2161636141505 is an equidigital number, since it uses as much as digits as its factorization.

2161636141505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432327228306.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 2161636141505 in words is "two trillion, one hundred sixty-one billion, six hundred thirty-six million, one hundred forty-one thousand, five hundred five".