665400245 has 8 divisors (see below), whose sum is σ = 799959480. Its totient is φ = 531334080.

The previous prime is 665400233. The next prime is 665400271. The reversal of 665400245 is 542004566.

It can be written as a sum of positive squares in 4 ways, for example, as 24196561 + 641203684 = 4919^2 + 25322^2 .

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

It is not a de Polignac number, because 665400245 - 2⁶ = 665400181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120290 + ... + 125699.

It is an arithmetic number, because the mean of its divisors is an integer number (99994935).

Almost surely, 2^665400245 is an apocalyptic number.

It is an amenable number.

665400245 is a deficient number, since it is larger than the sum of its proper divisors (134559235).

665400245 is a wasteful number, since it uses less digits than its factorization.

665400245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246535.

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 665400245 is about 25795.3531668012. The cubic root of 665400245 is about 873.0269534848.

The spelling of 665400245 in words is "six hundred sixty-five million, four hundred thousand, two hundred forty-five".