721522522451265 has 16 divisors (see below), whose sum is σ = 1154436874701696. Its totient is φ = 384811732380800.

The previous prime is 721522522451261. The next prime is 721522522451273. The reversal of 721522522451265 is 562154225225127.

It is not a de Polignac number, because 721522522451265 - 2² = 721522522451261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721522522451261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4772125 + ... + 38286005.

It is an arithmetic number, because the mean of its divisors is an integer number (72152304668856).

Almost surely, 2^{721522522451265} is an apocalyptic number.

It is an amenable number.

721522522451265 is a deficient number, since it is larger than the sum of its proper divisors (432914352250431).

721522522451265 is a wasteful number, since it uses less digits than its factorization.

721522522451265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34949160.

The product of its digits is 6720000, while the sum is 51.

The spelling of 721522522451265 in words is "seven hundred twenty-one trillion, five hundred twenty-two billion, five hundred twenty-two million, four hundred fifty-one thousand, two hundred sixty-five".