165755775 has 12 divisors (see below), whose sum is σ = 274049672. Its totient is φ = 88403040.

The previous prime is 165755773. The next prime is 165755783. The reversal of 165755775 is 577557561.

It is not a de Polignac number, because 165755775 - 2¹ = 165755773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165755773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104964 + ... + 1105113.

Almost surely, 2^165755775 is an apocalyptic number.

165755775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165755775 is a deficient number, since it is larger than the sum of its proper divisors (108293897).

165755775 is a wasteful number, since it uses less digits than its factorization.

165755775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210090 (or 2210085 counting only the distinct ones).

The product of its digits is 1286250, while the sum is 48.

The square root of 165755775 is about 12874.6174700455. The cubic root of 165755775 is about 549.3168101201.

The spelling of 165755775 in words is "one hundred sixty-five million, seven hundred fifty-five thousand, seven hundred seventy-five".