165700101 has 20 divisors (see below), whose sum is σ = 257351072. Its totient is φ = 92899248.

The previous prime is 165700099. The next prime is 165700103. The reversal of 165700101 is 101007561.

It is an interprime number because it is at equal distance from previous prime (165700099) and next prime (165700103).

It is not a de Polignac number, because 165700101 - 2¹ = 165700099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165700103) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3126391 + ... + 3126443.

Almost surely, 2^165700101 is an apocalyptic number.

It is an amenable number.

165700101 is a deficient number, since it is larger than the sum of its proper divisors (91650971).

165700101 is an frugal number, since it uses more digits than its factorization.

165700101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 21.

The square root of 165700101 is about 12872.4551271310. The cubic root of 165700101 is about 549.2553017780.

Multiplying 165700101 by its sum of digits (21), we get a square (3479702121 = 58989²).

165700101 divided by its sum of digits (21) gives a 4-th power (7890481 = 53⁴).

Adding to 165700101 its reverse (101007561), we get a palindrome (266707662).

The spelling of 165700101 in words is "one hundred sixty-five million, seven hundred thousand, one hundred one".