165000653981 has 8 divisors (see below), whose sum is σ = 165636264960. Its totient is φ = 164366110432.

The previous prime is 165000653969. The next prime is 165000654023. The reversal of 165000653981 is 189356000561.

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 165000653981 - 2¹⁸ = 165000391837 is a prime.

It is a super-2 number, since 2×165000653981² (a number of 23 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 (165009653981) 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, 43586 + ... + 576108.

It is an arithmetic number, because the mean of its divisors is an integer number (20704533120).

Almost surely, 2^165000653981 is an apocalyptic number.

It is an amenable number.

165000653981 is a deficient number, since it is larger than the sum of its proper divisors (635610979).

165000653981 is an equidigital number, since it uses as much as digits as its factorization.

165000653981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533715.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 165000653981 in words is "one hundred sixty-five billion, six hundred fifty-three thousand, nine hundred eighty-one".