165140645 has 8 divisors (see below), whose sum is σ = 205002360. Its totient is φ = 127556800.

The previous prime is 165140641. The next prime is 165140653. The reversal of 165140645 is 546041561.

165140645 = T₈₁₂₅ + T₈₁₂₆ + ... + T₈₁₂₉.

It can be written as a sum of positive squares in 4 ways, for example, as 21883684 + 143256961 = 4678^2 + 11969^2 .

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

It is not a de Polignac number, because 165140645 - 2² = 165140641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165140641) 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, 569306 + ... + 569595.

It is an arithmetic number, because the mean of its divisors is an integer number (25625295).

Almost surely, 2^165140645 is an apocalyptic number.

It is an amenable number.

165140645 is a deficient number, since it is larger than the sum of its proper divisors (39861715).

165140645 is a wasteful number, since it uses less digits than its factorization.

165140645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138935.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 165140645 is about 12850.7060117334. The cubic root of 165140645 is about 548.6364515138.

The spelling of 165140645 in words is "one hundred sixty-five million, one hundred forty thousand, six hundred forty-five".