665214845 has 16 divisors (see below), whose sum is σ = 853938288. Its totient is φ = 495697920.

The previous prime is 665214799. The next prime is 665214853. The reversal of 665214845 is 548412566.

It can be written as a sum of positive squares in 8 ways, for example, as 113763556 + 551451289 = 10666^2 + 23483^2 .

It is not a de Polignac number, because 665214845 - 2²² = 661020541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32096 + ... + 48585.

It is an arithmetic number, because the mean of its divisors is an integer number (53371143).

Almost surely, 2^665214845 is an apocalyptic number.

It is an amenable number.

665214845 is a deficient number, since it is larger than the sum of its proper divisors (188723443).

665214845 is a wasteful number, since it uses less digits than its factorization.

665214845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80800.

The product of its digits is 230400, while the sum is 41.

The square root of 665214845 is about 25791.7592459297. The cubic root of 665214845 is about 872.9458623252.

The spelling of 665214845 in words is "six hundred sixty-five million, two hundred fourteen thousand, eight hundred forty-five".