2661405510163 has 4 divisors (see below), whose sum is σ = 2661605044120. Its totient is φ = 2661205976208.

The previous prime is 2661405510143. The next prime is 2661405510187. The reversal of 2661405510163 is 3610155041662.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661405510163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661405510143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99746970 + ... + 99773647.

It is an arithmetic number, because the mean of its divisors is an integer number (665401261030).

Almost surely, 2^{2661405510163} is an apocalyptic number.

2661405510163 is a deficient number, since it is larger than the sum of its proper divisors (199533957).

2661405510163 is a wasteful number, since it uses less digits than its factorization.

2661405510163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199533956.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 2661405510163 in words is "two trillion, six hundred sixty-one billion, four hundred five million, five hundred ten thousand, one hundred sixty-three".