181664025274369 has 8 divisors (see below), whose sum is σ = 198181092892608. Its totient is φ = 165147317027760.

The previous prime is 181664025274351. The next prime is 181664025274393. The reversal of 181664025274369 is 963472520466181.

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 181664025274369 - 2¹¹ = 181664025272321 is a prime.

It is a super-2 number, since 2×181664025274369² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181664025274369.

It is not an unprimeable number, because it can be changed into a prime (181664025274349) 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, 88785397 + ... + 90808450.

It is an arithmetic number, because the mean of its divisors is an integer number (24772636611576).

It is a 1-persistent number, because it is pandigital, but 2⋅181664025274369 = 363328050548738 is not.

Almost surely, 2^{181664025274369} is an apocalyptic number.

It is an amenable number.

181664025274369 is a deficient number, since it is larger than the sum of its proper divisors (16517067618239).

181664025274369 is a wasteful number, since it uses less digits than its factorization.

181664025274369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179685815.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 181664025274369 in words is "one hundred eighty-one trillion, six hundred sixty-four billion, twenty-five million, two hundred seventy-four thousand, three hundred sixty-nine".