647666053 has 8 divisors (see below), whose sum is σ = 698382720. Its totient is φ = 598612320.

The previous prime is 647666023. The next prime is 647666057. The reversal of 647666053 is 350666746.

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 647666053 - 2⁵ = 647666021 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 (647666057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414925 + ... + 416482.

It is an arithmetic number, because the mean of its divisors is an integer number (87297840).

Almost surely, 2^647666053 is an apocalyptic number.

It is an amenable number.

647666053 is a deficient number, since it is larger than the sum of its proper divisors (50716667).

647666053 is a wasteful number, since it uses less digits than its factorization.

647666053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831467.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 647666053 is about 25449.2839388459. The cubic root of 647666053 is about 865.2010638888.

The spelling of 647666053 in words is "six hundred forty-seven million, six hundred sixty-six thousand, fifty-three".