165556601 has 8 divisors (see below), whose sum is σ = 189781824. Its totient is φ = 141474960.

The previous prime is 165556597. The next prime is 165556603. The reversal of 165556601 is 106655561.

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 165556601 - 2² = 165556597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165556603) 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, 33410 + ... + 38043.

It is an arithmetic number, because the mean of its divisors is an integer number (23722728).

Almost surely, 2^165556601 is an apocalyptic number.

It is an amenable number.

165556601 is a deficient number, since it is larger than the sum of its proper divisors (24225223).

165556601 is an equidigital number, since it uses as much as digits as its factorization.

165556601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71791.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165556601 is about 12866.8800025492. The cubic root of 165556601 is about 549.0967001858.

The spelling of 165556601 in words is "one hundred sixty-five million, five hundred fifty-six thousand, six hundred one".