725111221523 has 4 divisors (see below), whose sum is σ = 780889007808. Its totient is φ = 669333435240.

The previous prime is 725111221487. The next prime is 725111221531. The reversal of 725111221523 is 325122111527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 725111221523 - 2²² = 725107027219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 725111221523.

It is not an unprimeable number, because it can be changed into a prime (725110221523) 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 3 ways as a sum of consecutive naturals, for example, 27888893123 + ... + 27888893148.

It is an arithmetic number, because the mean of its divisors is an integer number (195222251952).

Almost surely, 2^725111221523 is an apocalyptic number.

725111221523 is a deficient number, since it is larger than the sum of its proper divisors (55777786285).

725111221523 is a wasteful number, since it uses less digits than its factorization.

725111221523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55777786284.

The product of its digits is 8400, while the sum is 32.

The spelling of 725111221523 in words is "seven hundred twenty-five billion, one hundred eleven million, two hundred twenty-one thousand, five hundred twenty-three".