647668688471 has 8 divisors (see below), whose sum is σ = 779150302080. Its totient is φ = 525926453688.

The previous prime is 647668688461. The next prime is 647668688473. The reversal of 647668688471 is 174886866746.

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 647668688471 - 2¹⁴ = 647668672087 is a prime.

It is a super-3 number, since 3×647668688471³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647668688395 and 647668688404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647668688473) 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, 2434844561 + ... + 2434844826.

It is an arithmetic number, because the mean of its divisors is an integer number (97393787760).

Almost surely, 2^647668688471 is an apocalyptic number.

647668688471 is a deficient number, since it is larger than the sum of its proper divisors (131481613609).

647668688471 is a wasteful number, since it uses less digits than its factorization.

647668688471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4869689413.

The product of its digits is 520224768, while the sum is 71.

The spelling of 647668688471 in words is "six hundred forty-seven billion, six hundred sixty-eight million, six hundred eighty-eight thousand, four hundred seventy-one".