4521724721536 has 64 divisors (see below), whose sum is σ = 9853821596160. Its totient is φ = 2049728832000.

The previous prime is 4521724721491. The next prime is 4521724721573. The reversal of 4521724721536 is 6351274271254.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 4521724721536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3858540 + ... + 4892011.

It is an arithmetic number, because the mean of its divisors is an integer number (153965962440).

Almost surely, 2^{4521724721536} is an apocalyptic number.

It is an amenable number.

4521724721536 is an abundant number, since it is smaller than the sum of its proper divisors (5332096874624).

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

4521724721536 is a wasteful number, since it uses less digits than its factorization.

4521724721536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750943 (or 8750931 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 49.

The spelling of 4521724721536 in words is "four trillion, five hundred twenty-one billion, seven hundred twenty-four million, seven hundred twenty-one thousand, five hundred thirty-six".