721523112325455 has 32 divisors (see below), whose sum is σ = 1264790885379840. Its totient is φ = 348327974094080.

The previous prime is 721523112325453. The next prime is 721523112325481. The reversal of 721523112325455 is 554523211325127.

It is not a de Polignac number, because 721523112325455 - 2¹ = 721523112325453 is a prime.

It is a super-2 number, since 2×721523112325455² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721523112325453) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 9383797065 + ... + 9383873954.

It is an arithmetic number, because the mean of its divisors is an integer number (39524715168120).

Almost surely, 2^{721523112325455} is an apocalyptic number.

721523112325455 is a deficient number, since it is larger than the sum of its proper divisors (543267773054385).

721523112325455 is a wasteful number, since it uses less digits than its factorization.

721523112325455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18767671271.

The product of its digits is 2520000, while the sum is 48.

The spelling of 721523112325455 in words is "seven hundred twenty-one trillion, five hundred twenty-three billion, one hundred twelve million, three hundred twenty-five thousand, four hundred fifty-five".