665136445 has 8 divisors (see below), whose sum is σ = 798994944. Its totient is φ = 531555024.

The previous prime is 665136443. The next prime is 665136463. The reversal of 665136445 is 544631566.

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

It is a cyclic number.

It is not a de Polignac number, because 665136445 - 2¹ = 665136443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665136398 and 665136407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665136443) by changing a digit.

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, 63949 + ... + 73618.

It is an arithmetic number, because the mean of its divisors is an integer number (99874368).

Almost surely, 2^665136445 is an apocalyptic number.

It is an amenable number.

665136445 is a deficient number, since it is larger than the sum of its proper divisors (133858499).

665136445 is a wasteful number, since it uses less digits than its factorization.

665136445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138539.

The product of its digits is 259200, while the sum is 40.

The square root of 665136445 is about 25790.2393358418. The cubic root of 665136445 is about 872.9115668165.

The spelling of 665136445 in words is "six hundred sixty-five million, one hundred thirty-six thousand, four hundred forty-five".