665744053 has 4 divisors (see below), whose sum is σ = 716955148. Its totient is φ = 614532960.

The previous prime is 665744047. The next prime is 665744099. The reversal of 665744053 is 350447566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119727364 + 546016689 = 10942^2 + 23367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665744053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665743997 and 665744015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665744153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25605528 + ... + 25605553.

It is an arithmetic number, because the mean of its divisors is an integer number (179238787).

Almost surely, 2^665744053 is an apocalyptic number.

It is an amenable number.

665744053 is a deficient number, since it is larger than the sum of its proper divisors (51211095).

665744053 is a wasteful number, since it uses less digits than its factorization.

665744053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51211094.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 665744053 is about 25802.0164522078. The cubic root of 665744053 is about 873.1772900540.

The spelling of 665744053 in words is "six hundred sixty-five million, seven hundred forty-four thousand, fifty-three".