165398320001 has 8 divisors (see below), whose sum is σ = 166000722408. Its totient is φ = 164796016000.

The previous prime is 165398319979. The next prime is 165398320051. The reversal of 165398320001 is 100023893561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 144077939776 + 21320380225 = 379576^2 + 146015^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165398320001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165398320051) 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, 5983031 + ... + 6010611.

It is an arithmetic number, because the mean of its divisors is an integer number (20750090301).

Almost surely, 2^165398320001 is an apocalyptic number.

It is an amenable number.

165398320001 is a deficient number, since it is larger than the sum of its proper divisors (602402407).

165398320001 is a wasteful number, since it uses less digits than its factorization.

165398320001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49203.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 165398320001 in words is "one hundred sixty-five billion, three hundred ninety-eight million, three hundred twenty thousand, one".