665424901 has 4 divisors (see below), whose sum is σ = 666607392. Its totient is φ = 664242412.

The previous prime is 665424883. The next prime is 665424917. The reversal of 665424901 is 109424566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665424901 - 2¹¹ = 665422853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665424971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590401 + ... + 591526.

It is an arithmetic number, because the mean of its divisors is an integer number (166651848).

Almost surely, 2^665424901 is an apocalyptic number.

It is an amenable number.

665424901 is a deficient number, since it is larger than the sum of its proper divisors (1182491).

665424901 is a wasteful number, since it uses less digits than its factorization.

665424901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182490.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 665424901 is about 25795.8310779087. The cubic root of 665424901 is about 873.0377365120.

The spelling of 665424901 in words is "six hundred sixty-five million, four hundred twenty-four thousand, nine hundred one".