647676803657 has 8 divisors (see below), whose sum is σ = 697530987720. Its totient is φ = 597827318400.

The previous prime is 647676803623. The next prime is 647676803663. The reversal of 647676803657 is 756308676746.

647676803657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1278491536 + 646398312121 = 35756^2 + 803989^2 .

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

It is not a de Polignac number, because 647676803657 - 2³⁰ = 646603061833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647676803593 and 647676803602.

It is not an unprimeable number, because it can be changed into a prime (647676809657) 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, 885782 + ... + 1442207.

It is an arithmetic number, because the mean of its divisors is an integer number (87191373465).

Almost surely, 2^647676803657 is an apocalyptic number.

It is an amenable number.

647676803657 is a deficient number, since it is larger than the sum of its proper divisors (49854184063).

647676803657 is a wasteful number, since it uses less digits than its factorization.

647676803657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349403.

The product of its (nonzero) digits is 213373440, while the sum is 65.

The spelling of 647676803657 in words is "six hundred forty-seven billion, six hundred seventy-six million, eight hundred three thousand, six hundred fifty-seven".