2166603512563 has 8 divisors (see below), whose sum is σ = 2488561107200. Its totient is φ = 1847756619720.

The previous prime is 2166603512539. The next prime is 2166603512603. The reversal of 2166603512563 is 3652153066612.

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-2166603512563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166603512503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777673953 + ... + 777676738.

It is an arithmetic number, because the mean of its divisors is an integer number (311070138400).

Almost surely, 2^{2166603512563} is an apocalyptic number.

2166603512563 is a deficient number, since it is larger than the sum of its proper divisors (321957594637).

2166603512563 is a wasteful number, since it uses less digits than its factorization.

2166603512563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555350897.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 2166603512563 in words is "two trillion, one hundred sixty-six billion, six hundred three million, five hundred twelve thousand, five hundred sixty-three".