716311781521 has 16 divisors (see below), whose sum is σ = 820688275584. Its totient is φ = 612448591104.

The previous prime is 716311781503. The next prime is 716311781561. The reversal of 716311781521 is 125187113617.

It is not a de Polignac number, because 716311781521 - 2¹⁵ = 716311748753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (716311781561) 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, 4918665 + ... + 5062201.

It is an arithmetic number, because the mean of its divisors is an integer number (51293017224).

Almost surely, 2^716311781521 is an apocalyptic number.

It is an amenable number.

716311781521 is a deficient number, since it is larger than the sum of its proper divisors (104376494063).

716311781521 is a wasteful number, since it uses less digits than its factorization.

716311781521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145320.

The product of its digits is 70560, while the sum is 43.

The spelling of 716311781521 in words is "seven hundred sixteen billion, three hundred eleven million, seven hundred eighty-one thousand, five hundred twenty-one".