721716634245 has 16 divisors (see below), whose sum is σ = 1160549366400. Its totient is φ = 382981287744.

The previous prime is 721716634189. The next prime is 721716634259. The reversal of 721716634245 is 542436617127.

It is not a de Polignac number, because 721716634245 - 2⁷ = 721716634117 is a prime.

It is a super-2 number, since 2×721716634245² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721716634194 and 721716634203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120887574 + ... + 120893543.

It is an arithmetic number, because the mean of its divisors is an integer number (72534335400).

Almost surely, 2^721716634245 is an apocalyptic number.

It is an amenable number.

721716634245 is a deficient number, since it is larger than the sum of its proper divisors (438832732155).

721716634245 is a wasteful number, since it uses less digits than its factorization.

721716634245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241781324.

The product of its digits is 1693440, while the sum is 48.

The spelling of 721716634245 in words is "seven hundred twenty-one billion, seven hundred sixteen million, six hundred thirty-four thousand, two hundred forty-five".