45171781873 has 4 divisors (see below), whose sum is σ = 45175772068. Its totient is φ = 45167791680.

The previous prime is 45171781861. The next prime is 45171781877. The reversal of 45171781873 is 37818717154.

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 25992855729 + 19178926144 = 161223^2 + 138488^2 .

It is a cyclic number.

It is not a de Polignac number, because 45171781873 - 2⁵ = 45171781841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 45171781873.

It is not an unprimeable number, because it can be changed into a prime (45171781877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978068 + ... + 2000773.

It is an arithmetic number, because the mean of its divisors is an integer number (11293943017).

Almost surely, 2^45171781873 is an apocalyptic number.

It is an amenable number.

45171781873 is a deficient number, since it is larger than the sum of its proper divisors (3990195).

45171781873 is a wasteful number, since it uses less digits than its factorization.

45171781873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990194.

The product of its digits is 1317120, while the sum is 52.

The spelling of 45171781873 in words is "forty-five billion, one hundred seventy-one million, seven hundred eighty-one thousand, eight hundred seventy-three".