165478501 has 16 divisors (see below), whose sum is σ = 173502000. Its totient is φ = 157696000.

The previous prime is 165478477. The next prime is 165478507. The reversal of 165478501 is 105874561.

It can be written as a sum of positive squares in 8 ways, for example, as 1612900 + 163865601 = 1270^2 + 12801^2 .

It is a cyclic number.

It is not a de Polignac number, because 165478501 - 2⁹ = 165477989 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165478507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368325 + ... + 368773.

It is an arithmetic number, because the mean of its divisors is an integer number (10843875).

Almost surely, 2^165478501 is an apocalyptic number.

It is an amenable number.

165478501 is a deficient number, since it is larger than the sum of its proper divisors (8023499).

165478501 is a wasteful number, since it uses less digits than its factorization.

165478501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 165478501 is about 12863.8447207668. The cubic root of 165478501 is about 549.0103426153.

The spelling of 165478501 in words is "one hundred sixty-five million, four hundred seventy-eight thousand, five hundred one".