6651511650217 has 16 divisors (see below), whose sum is σ = 7812002413440. Its totient is φ = 5543779961088.

The previous prime is 6651511650181. The next prime is 6651511650283. The reversal of 6651511650217 is 7120561151566.

It is a cyclic number.

It is not a de Polignac number, because 6651511650217 - 2¹⁵ = 6651511617449 is a prime.

It is a super-2 number, since 2×6651511650217² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6651511650517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7511968 + ... + 8350609.

It is an arithmetic number, because the mean of its divisors is an integer number (488250150840).

Almost surely, 2^{6651511650217} is an apocalyptic number.

It is an amenable number.

6651511650217 is a deficient number, since it is larger than the sum of its proper divisors (1160490763223).

6651511650217 is a wasteful number, since it uses less digits than its factorization.

6651511650217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15864240.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 6651511650217 in words is "six trillion, six hundred fifty-one billion, five hundred eleven million, six hundred fifty thousand, two hundred seventeen".