6516217654 has 16 divisors (see below), whose sum is σ = 9835356960. Its totient is φ = 3237783040.

The previous prime is 6516217649. The next prime is 6516217679. The reversal of 6516217654 is 4567126156.

It is a super-2 number, since 2×6516217654² = 84922185028602527432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6516217654.

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, 1481799 + ... + 1486189.

It is an arithmetic number, because the mean of its divisors is an integer number (614709810).

Almost surely, 2^6516217654 is an apocalyptic number.

6516217654 is a deficient number, since it is larger than the sum of its proper divisors (3319139306).

6516217654 is a wasteful number, since it uses less digits than its factorization.

6516217654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8855.

The product of its digits is 302400, while the sum is 43.

The square root of 6516217654 is about 80723.0924457184. The cubic root of 6516217654 is about 1867.8064066331.

The spelling of 6516217654 in words is "six billion, five hundred sixteen million, two hundred seventeen thousand, six hundred fifty-four".