2161561150663 has 8 divisors (see below), whose sum is σ = 2170228878720. Its totient is φ = 2152893867000.

The previous prime is 2161561150601. The next prime is 2161561150681. The reversal of 2161561150663 is 3660511651612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161561150663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161561156663) 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 7 ways as a sum of consecutive naturals, for example, 12493956 + ... + 12665782.

It is an arithmetic number, because the mean of its divisors is an integer number (271278609840).

Almost surely, 2^{2161561150663} is an apocalyptic number.

2161561150663 is a deficient number, since it is larger than the sum of its proper divisors (8667728057).

2161561150663 is a wasteful number, since it uses less digits than its factorization.

2161561150663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222197.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 2161561150663 in words is "two trillion, one hundred sixty-one billion, five hundred sixty-one million, one hundred fifty thousand, six hundred sixty-three".