721533542303537 has 24 divisors (see below), whose sum is σ = 767727557369856. Its totient is φ = 677978051534784.

The previous prime is 721533542303531. The next prime is 721533542303557. The reversal of 721533542303537 is 735303245335127.

721533542303537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721533542303537 - 2²⁶ = 721533475194673 is a prime.

It is a super-2 number, since 2×721533542303537² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721533542303531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155100608 + ... + 159684894.

It is an arithmetic number, because the mean of its divisors is an integer number (31988648223744).

Almost surely, 2^{721533542303537} is an apocalyptic number.

It is an amenable number.

721533542303537 is a deficient number, since it is larger than the sum of its proper divisors (46194015066319).

721533542303537 is a wasteful number, since it uses less digits than its factorization.

721533542303537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587885 (or 4587866 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 53.

The spelling of 721533542303537 in words is "seven hundred twenty-one trillion, five hundred thirty-three billion, five hundred forty-two million, three hundred three thousand, five hundred thirty-seven".