165737661 has 8 divisors (see below), whose sum is σ = 223011360. Its totient is φ = 109477872.

The previous prime is 165737659. The next prime is 165737707. The reversal of 165737661 is 166737561.

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

It is not a de Polignac number, because 165737661 - 2¹ = 165737659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165737161) 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, 253095 + ... + 253748.

It is an arithmetic number, because the mean of its divisors is an integer number (27876420).

Almost surely, 2^165737661 is an apocalyptic number.

It is an amenable number.

165737661 is a deficient number, since it is larger than the sum of its proper divisors (57273699).

165737661 is a wasteful number, since it uses less digits than its factorization.

165737661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506955.

The product of its digits is 158760, while the sum is 42.

The square root of 165737661 is about 12873.9139736135. The cubic root of 165737661 is about 549.2967993800.

The spelling of 165737661 in words is "one hundred sixty-five million, seven hundred thirty-seven thousand, six hundred sixty-one".