666053501 has 4 divisors (see below), whose sum is σ = 669040512. Its totient is φ = 663066492.

The previous prime is 666053467. The next prime is 666053513. The reversal of 666053501 is 105350666.

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 a de Polignac number, because none of the positive numbers 2^k-666053501 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 (666053551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1493171 + ... + 1493616.

It is an arithmetic number, because the mean of its divisors is an integer number (167260128).

Almost surely, 2^666053501 is an apocalyptic number.

It is an amenable number.

666053501 is a deficient number, since it is larger than the sum of its proper divisors (2987011).

666053501 is a wasteful number, since it uses less digits than its factorization.

666053501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2987010.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 666053501 is about 25808.0123411316. The cubic root of 666053501 is about 873.3125578098.

The spelling of 666053501 in words is "six hundred sixty-six million, fifty-three thousand, five hundred one".