8162720138761 has 2 divisors, whose sum is σ = 8162720138762. Its totient is φ = 8162720138760.

The previous prime is 8162720138693. The next prime is 8162720138791. The reversal of 8162720138761 is 1678310272618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8087084688400 + 75635450361 = 2843780^2 + 275019^2 .

It is a cyclic number.

It is not a de Polignac number, because 8162720138761 - 2²⁵ = 8162686584329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8162720138699 and 8162720138708.

It is not a weakly prime, because it can be changed into another prime (8162720138791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4081360069380 + 4081360069381.

It is an arithmetic number, because the mean of its divisors is an integer number (4081360069381).

Almost surely, 2^{8162720138761} is an apocalyptic number.

It is an amenable number.

8162720138761 is a deficient number, since it is larger than the sum of its proper divisors (1).

8162720138761 is an equidigital number, since it uses as much as digits as its factorization.

8162720138761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 8162720138761 in words is "eight trillion, one hundred sixty-two billion, seven hundred twenty million, one hundred thirty-eight thousand, seven hundred sixty-one".