8172651517 has 2 divisors, whose sum is σ = 8172651518. Its totient is φ = 8172651516.

The previous prime is 8172651499. The next prime is 8172651593. The reversal of 8172651517 is 7151562718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6880536601 + 1292114916 = 82949^2 + 35946^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172651517 - 2²⁷ = 8038433789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8172651217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086325758 + 4086325759.

It is an arithmetic number, because the mean of its divisors is an integer number (4086325759).

Almost surely, 2^8172651517 is an apocalyptic number.

It is an amenable number.

8172651517 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172651517 is an equidigital number, since it uses as much as digits as its factorization.

8172651517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 43.

The square root of 8172651517 is about 90402.7185266018. The cubic root of 8172651517 is about 2014.2853478987.

The spelling of 8172651517 in words is "eight billion, one hundred seventy-two million, six hundred fifty-one thousand, five hundred seventeen".