2100663545 has 4 divisors (see below), whose sum is σ = 2520796260. Its totient is φ = 1680530832.

The previous prime is 2100663511. The next prime is 2100663547. The reversal of 2100663545 is 5453660012.

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 1136498944 + 964164601 = 33712^2 + 31051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100663545 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2100663547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210066350 + ... + 210066359.

It is an arithmetic number, because the mean of its divisors is an integer number (630199065).

Almost surely, 2^2100663545 is an apocalyptic number.

It is an amenable number.

2100663545 is a deficient number, since it is larger than the sum of its proper divisors (420132715).

2100663545 is an equidigital number, since it uses as much as digits as its factorization.

2100663545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420132714.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 2100663545 is about 45832.9962472453. The cubic root of 2100663545 is about 1280.7140272766.

The spelling of 2100663545 in words is "two billion, one hundred million, six hundred sixty-three thousand, five hundred forty-five".