6155101666561 has 8 divisors (see below), whose sum is σ = 6226757748200. Its totient is φ = 6083721717120.

The previous prime is 6155101666507. The next prime is 6155101666573. The reversal of 6155101666561 is 1656661015516.

It can be written as a sum of positive squares in 4 ways, for example, as 2096009017600 + 4059092648961 = 1447760^2 + 2014719^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6155101666561 - 2¹¹ = 6155101664513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6155101666501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68988210 + ... + 69077371.

It is an arithmetic number, because the mean of its divisors is an integer number (778344718525).

Almost surely, 2^{6155101666561} is an apocalyptic number.

It is an amenable number.

6155101666561 is a deficient number, since it is larger than the sum of its proper divisors (71656081639).

6155101666561 is a wasteful number, since it uses less digits than its factorization.

6155101666561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138066099.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 6155101666561 in words is "six trillion, one hundred fifty-five billion, one hundred one million, six hundred sixty-six thousand, five hundred sixty-one".