6521172668 has 24 divisors (see below), whose sum is σ = 11557902720. Its totient is φ = 3219107760.

The previous prime is 6521172659. The next prime is 6521172683. The reversal of 6521172668 is 8662711256.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent 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, 112463 + ... + 160281.

It is an arithmetic number, because the mean of its divisors is an integer number (481579280).

Almost surely, 2^6521172668 is an apocalyptic number.

It is an amenable number.

6521172668 is a deficient number, since it is larger than the sum of its proper divisors (5036730052).

6521172668 is a wasteful number, since it uses less digits than its factorization.

6521172668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48257 (or 48255 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 6521172668 is about 80753.7780416495. The cubic root of 6521172668 is about 1868.2797211898.

The spelling of 6521172668 in words is "six billion, five hundred twenty-one million, one hundred seventy-two thousand, six hundred sixty-eight".