8166520731 has 16 divisors (see below), whose sum is σ = 11050958720. Its totient is φ = 5363392320.

The previous prime is 8166520709. The next prime is 8166520771. The reversal of 8166520731 is 1370256618.

It is not a de Polignac number, because 8166520731 - 2⁶ = 8166520667 is a prime.

It is a super-3 number, since 3×8166520731³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8166520731.

It is not an unprimeable number, because it can be changed into a prime (8166520771) 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, 166416 + ... + 209826.

It is an arithmetic number, because the mean of its divisors is an integer number (690684920).

Almost surely, 2^8166520731 is an apocalyptic number.

8166520731 is a deficient number, since it is larger than the sum of its proper divisors (2884437989).

8166520731 is a wasteful number, since it uses less digits than its factorization.

8166520731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44346.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 8166520731 is about 90368.8039701755. The cubic root of 8166520731 is about 2013.7815439776.

The spelling of 8166520731 in words is "eight billion, one hundred sixty-six million, five hundred twenty thousand, seven hundred thirty-one".