8161664122541 has 4 divisors (see below), whose sum is σ = 8273467740732. Its totient is φ = 8049860504352.

The previous prime is 8161664122531. The next prime is 8161664122583. The reversal of 8161664122541 is 1452214661618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3672477809641 + 4489186312900 = 1916371^2 + 2118770^2 .

It is a cyclic number.

It is not a de Polignac number, because 8161664122541 - 2³⁸ = 7886786215597 is a prime.

It is a super-2 number, since 2×8161664122541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161664122501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55901808986 + ... + 55901809131.

It is an arithmetic number, because the mean of its divisors is an integer number (2068366935183).

Almost surely, 2^{8161664122541} is an apocalyptic number.

It is an amenable number.

8161664122541 is a deficient number, since it is larger than the sum of its proper divisors (111803618191).

8161664122541 is a wasteful number, since it uses less digits than its factorization.

8161664122541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111803618190.

The product of its digits is 552960, while the sum is 47.

The spelling of 8161664122541 in words is "eight trillion, one hundred sixty-one billion, six hundred sixty-four million, one hundred twenty-two thousand, five hundred forty-one".