8161653961 has 2 divisors, whose sum is σ = 8161653962. Its totient is φ = 8161653960.

The previous prime is 8161653919. The next prime is 8161653989. The reversal of 8161653961 is 1693561618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7826763961 + 334890000 = 88469^2 + 18300^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161653961 - 2⁷ = 8161653833 is a prime.

It is a super-2 number, since 2×8161653961² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8161653901) 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, 4080826980 + 4080826981.

It is an arithmetic number, because the mean of its divisors is an integer number (4080826981).

Almost surely, 2^8161653961 is an apocalyptic number.

It is an amenable number.

8161653961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8161653961 is an equidigital number, since it uses as much as digits as its factorization.

8161653961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The square root of 8161653961 is about 90341.8726892464. The cubic root of 8161653961 is about 2013.3814323742.

The spelling of 8161653961 in words is "eight billion, one hundred sixty-one million, six hundred fifty-three thousand, nine hundred sixty-one".