4521720667725 has 36 divisors (see below), whose sum is σ = 8219783322816. Its totient is φ = 2375590551840.

The previous prime is 4521720667691. The next prime is 4521720667769. The reversal of 4521720667725 is 5277660271254.

4521720667725 is a `hidden beast` number, since 4 + 521 + 7 + 20 + 6 + 6 + 77 + 25 = 666.

It is not a de Polignac number, because 4521720667725 - 2¹⁷ = 4521720536653 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149959077 + ... + 149989226.

Almost surely, 2^{4521720667725} is an apocalyptic number.

4521720667725 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4521720667725 is a deficient number, since it is larger than the sum of its proper divisors (3698062655091).

4521720667725 is a wasteful number, since it uses less digits than its factorization.

4521720667725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299948386 (or 299948378 counting only the distinct ones).

The product of its (nonzero) digits is 9878400, while the sum is 54.

The spelling of 4521720667725 in words is "four trillion, five hundred twenty-one billion, seven hundred twenty million, six hundred sixty-seven thousand, seven hundred twenty-five".