721316155151005 has 4 divisors (see below), whose sum is σ = 865579386181212. Its totient is φ = 577052924120800.

The previous prime is 721316155150999. The next prime is 721316155151027. The reversal of 721316155151005 is 500151551613127.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 248962135189156 + 472354019961849 = 15778534^2 + 21733707^2 .

It is not a de Polignac number, because 721316155151005 - 2⁵ = 721316155150973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72131615515096 + ... + 72131615515105.

It is an arithmetic number, because the mean of its divisors is an integer number (216394846545303).

Almost surely, 2^{721316155151005} is an apocalyptic number.

It is an amenable number.

721316155151005 is a deficient number, since it is larger than the sum of its proper divisors (144263231030207).

721316155151005 is a wasteful number, since it uses less digits than its factorization.

721316155151005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144263231030206.

The product of its (nonzero) digits is 157500, while the sum is 43.

The spelling of 721316155151005 in words is "seven hundred twenty-one trillion, three hundred sixteen billion, one hundred fifty-five million, one hundred fifty-one thousand, five".