4123721745 has 120 divisors (see below), whose sum is σ = 8751630888. Its totient is φ = 1845296640.

The previous prime is 4123721741. The next prime is 4123721759. The reversal of 4123721745 is 5471273214.

4123721745 is a `hidden beast` number, since 412 + 3 + 72 + 174 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8242641 + 4115479104 = 2871^2 + 64152^2 .

It is not a de Polignac number, because 4123721745 - 2² = 4123721741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4123721741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 633829 + ... + 640301.

Almost surely, 2^4123721745 is an apocalyptic number.

4123721745 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4123721745 is an abundant number, since it is smaller than the sum of its proper divisors (4627909143).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4123721745 is a wasteful number, since it uses less digits than its factorization.

4123721745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6525 (or 6505 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 4123721745 is about 64216.2109206079. The cubic root of 4123721745 is about 1603.6014894272.

Adding to 4123721745 its reverse (5471273214), we get a palindrome (9594994959).

The spelling of 4123721745 in words is "four billion, one hundred twenty-three million, seven hundred twenty-one thousand, seven hundred forty-five".