8165751821501 has 2 divisors, whose sum is σ = 8165751821502. Its totient is φ = 8165751821500.

The previous prime is 8165751821471. The next prime is 8165751821567. The reversal of 8165751821501 is 1051281575618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8014391140900 + 151360680601 = 2830970^2 + 389051^2 .

It is a cyclic number.

It is not a de Polignac number, because 8165751821501 - 2³⁸ = 7890873914557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8165751821501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8105751821501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4082875910750 + 4082875910751.

It is an arithmetic number, because the mean of its divisors is an integer number (4082875910751).

Almost surely, 2^{8165751821501} is an apocalyptic number.

It is an amenable number.

8165751821501 is a deficient number, since it is larger than the sum of its proper divisors (1).

8165751821501 is an equidigital number, since it uses as much as digits as its factorization.

8165751821501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672000, while the sum is 50.

The spelling of 8165751821501 in words is "eight trillion, one hundred sixty-five billion, seven hundred fifty-one million, eight hundred twenty-one thousand, five hundred one".