647666105 has 8 divisors (see below), whose sum is σ = 802270464. Its totient is φ = 501418800.

The previous prime is 647666099. The next prime is 647666113. The reversal of 647666105 is 501666746.

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

It is not a de Polignac number, because 647666105 - 2¹² = 647662009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2089091 + ... + 2089400.

It is an arithmetic number, because the mean of its divisors is an integer number (100283808).

Almost surely, 2^647666105 is an apocalyptic number.

It is an amenable number.

647666105 is a deficient number, since it is larger than the sum of its proper divisors (154604359).

647666105 is a wasteful number, since it uses less digits than its factorization.

647666105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178527.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 647666105 is about 25449.2849604856. The cubic root of 647666105 is about 865.2010870440.

The spelling of 647666105 in words is "six hundred forty-seven million, six hundred sixty-six thousand, one hundred five".