165940637 has 4 divisors (see below), whose sum is σ = 165967836. Its totient is φ = 165913440.

The previous prime is 165940591. The next prime is 165940657. The reversal of 165940637 is 736049561.

165940637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165353881 + 586756 = 12859^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 165940637 - 2⁶ = 165940573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165940594 and 165940603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165940657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263 + ... + 18219.

It is an arithmetic number, because the mean of its divisors is an integer number (41491959).

Almost surely, 2^165940637 is an apocalyptic number.

It is an amenable number.

165940637 is a deficient number, since it is larger than the sum of its proper divisors (27199).

165940637 is an equidigital number, since it uses as much as digits as its factorization.

165940637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27198.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 165940637 is about 12881.7947895470. The cubic root of 165940637 is about 549.5209459469.

The spelling of 165940637 in words is "one hundred sixty-five million, nine hundred forty thousand, six hundred thirty-seven".