6561706100651 has 16 divisors (see below), whose sum is σ = 7664617312128. Its totient is φ = 5561627059200.

The previous prime is 6561706100647. The next prime is 6561706100659. The reversal of 6561706100651 is 1560016071656.

It is a cyclic number.

It is not a de Polignac number, because 6561706100651 - 2² = 6561706100647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561706100659) 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, 362076035 + ... + 362094156.

It is an arithmetic number, because the mean of its divisors is an integer number (479038582008).

Almost surely, 2^{6561706100651} is an apocalyptic number.

6561706100651 is a deficient number, since it is larger than the sum of its proper divisors (1102911211477).

6561706100651 is a wasteful number, since it uses less digits than its factorization.

6561706100651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724170262.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 6561706100651 in words is "six trillion, five hundred sixty-one billion, seven hundred six million, one hundred thousand, six hundred fifty-one".