165312945 has 24 divisors (see below), whose sum is σ = 327477696. Its totient is φ = 75571488.

The previous prime is 165312923. The next prime is 165313013. The reversal of 165312945 is 549213561.

It is not a de Polignac number, because 165312945 - 2⁶ = 165312881 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262087 + ... + 262716.

It is an arithmetic number, because the mean of its divisors is an integer number (13644904).

Almost surely, 2^165312945 is an apocalyptic number.

165312945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165312945 is a deficient number, since it is larger than the sum of its proper divisors (162164751).

165312945 is a wasteful number, since it uses less digits than its factorization.

165312945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524821 (or 524818 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 165312945 is about 12857.4081758339. The cubic root of 165312945 is about 548.8271923690.

The spelling of 165312945 in words is "one hundred sixty-five million, three hundred twelve thousand, nine hundred forty-five".