1873664545 has 4 divisors (see below), whose sum is σ = 2248397460. Its totient is φ = 1498931632.

The previous prime is 1873664531. The next prime is 1873664591. The reversal of 1873664545 is 5454663781.

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 277422336 + 1596242209 = 16656^2 + 39953^2 .

It is a cyclic number.

It is not a de Polignac number, because 1873664545 - 2¹⁵ = 1873631777 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187366450 + ... + 187366459.

It is an arithmetic number, because the mean of its divisors is an integer number (562099365).

Almost surely, 2^1873664545 is an apocalyptic number.

It is an amenable number.

1873664545 is a deficient number, since it is larger than the sum of its proper divisors (374732915).

1873664545 is an equidigital number, since it uses as much as digits as its factorization.

1873664545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374732914.

The product of its digits is 2419200, while the sum is 49.

The square root of 1873664545 is about 43285.8469363833. The cubic root of 1873664545 is about 1232.8132107223.

The spelling of 1873664545 in words is "one billion, eight hundred seventy-three million, six hundred sixty-four thousand, five hundred forty-five".