647666041 has 8 divisors (see below), whose sum is σ = 707907168. Its totient is φ = 587652000.

The previous prime is 647666023. The next prime is 647666057. The reversal of 647666041 is 140666746.

It is a happy number.

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 647666041 - 2¹¹ = 647663993 is a prime.

It is a super-2 number, since 2×647666041² = 838942601329227362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647665985 and 647666003.

It is not an unprimeable number, because it can be changed into a prime (647666011) 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, 50775 + ... + 62236.

It is an arithmetic number, because the mean of its divisors is an integer number (88488396).

Almost surely, 2^647666041 is an apocalyptic number.

It is an amenable number.

647666041 is a deficient number, since it is larger than the sum of its proper divisors (60241127).

647666041 is a wasteful number, since it uses less digits than its factorization.

647666041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113543.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 647666041 is about 25449.2837030829. The cubic root of 647666041 is about 865.2010585453.

It can be divided in two parts, 64766 and 6041, that added together give a palindrome (70807).

The spelling of 647666041 in words is "six hundred forty-seven million, six hundred sixty-six thousand, forty-one".