721716900667 has 16 divisors (see below), whose sum is σ = 844265790720. Its totient is φ = 604038651552.

The previous prime is 721716900647. The next prime is 721716900677. The reversal of 721716900667 is 766009617127.

It is not a de Polignac number, because 721716900667 - 2¹¹ = 721716898619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721716900637) 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, 589809 + ... + 1338397.

It is an arithmetic number, because the mean of its divisors is an integer number (52766611920).

Almost surely, 2^721716900667 is an apocalyptic number.

721716900667 is a deficient number, since it is larger than the sum of its proper divisors (122548890053).

721716900667 is a wasteful number, since it uses less digits than its factorization.

721716900667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751842.

The product of its (nonzero) digits is 1333584, while the sum is 52.

The spelling of 721716900667 in words is "seven hundred twenty-one billion, seven hundred sixteen million, nine hundred thousand, six hundred sixty-seven".