8181653229661 has 8 divisors (see below), whose sum is σ = 8466638830848. Its totient is φ = 7897983960000.

The previous prime is 8181653229653. The next prime is 8181653229689. The reversal of 8181653229661 is 1669223561818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8181653229661 - 2³ = 8181653229653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8181653229596 and 8181653229605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181653229601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329070235 + ... + 329095096.

It is an arithmetic number, because the mean of its divisors is an integer number (1058329853856).

Almost surely, 2^{8181653229661} is an apocalyptic number.

It is an amenable number.

8181653229661 is a deficient number, since it is larger than the sum of its proper divisors (284985601187).

8181653229661 is a wasteful number, since it uses less digits than its factorization.

8181653229661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658165763.

The product of its digits is 7464960, while the sum is 58.

The spelling of 8181653229661 in words is "eight trillion, one hundred eighty-one billion, six hundred fifty-three million, two hundred twenty-nine thousand, six hundred sixty-one".