6561725251017 has 4 divisors (see below), whose sum is σ = 8748967001360. Its totient is φ = 4374483500676.

The previous prime is 6561725250919. The next prime is 6561725251021. The reversal of 6561725251017 is 7101525271656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6561725251017 - 2¹⁰ = 6561725249993 is a prime.

It is a super-2 number, since 2×6561725251017² (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 (6561725251027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1093620875167 + ... + 1093620875172.

It is an arithmetic number, because the mean of its divisors is an integer number (2187241750340).

Almost surely, 2^{6561725251017} is an apocalyptic number.

It is an amenable number.

6561725251017 is a deficient number, since it is larger than the sum of its proper divisors (2187241750343).

6561725251017 is a wasteful number, since it uses less digits than its factorization.

6561725251017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187241750342.

The product of its (nonzero) digits is 882000, while the sum is 48.

The spelling of 6561725251017 in words is "six trillion, five hundred sixty-one billion, seven hundred twenty-five million, two hundred fifty-one thousand, seventeen".