61326546166601 has 4 divisors (see below), whose sum is σ = 64933990058772. Its totient is φ = 57719102274432.

The previous prime is 61326546166559. The next prime is 61326546166619. The reversal of 61326546166601 is 10666164562316.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38864302047376 + 22462244119225 = 6234124^2 + 4739435^2 .

It is a cyclic number.

It is not a de Polignac number, because 61326546166601 - 2¹⁸ = 61326545904457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61326546166661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803721946060 + ... + 1803721946093.

It is an arithmetic number, because the mean of its divisors is an integer number (16233497514693).

Almost surely, 2^{61326546166601} is an apocalyptic number.

It is an amenable number.

61326546166601 is a deficient number, since it is larger than the sum of its proper divisors (3607443892171).

61326546166601 is a wasteful number, since it uses less digits than its factorization.

61326546166601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607443892170.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 61326546166601 in words is "sixty-one trillion, three hundred twenty-six billion, five hundred forty-six million, one hundred sixty-six thousand, six hundred one".