66006143521261 has 16 divisors (see below), whose sum is σ = 66526140248640. Its totient is φ = 65487857754880.

The previous prime is 66006143521237. The next prime is 66006143521303. The reversal of 66006143521261 is 16212534160066.

It is a cyclic number.

It is not a de Polignac number, because 66006143521261 - 2⁵ = 66006143521229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66006143521211) 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, 191126901 + ... + 191471941.

It is an arithmetic number, because the mean of its divisors is an integer number (4157883765540).

Almost surely, 2^{66006143521261} is an apocalyptic number.

It is an amenable number.

66006143521261 is a deficient number, since it is larger than the sum of its proper divisors (519996727379).

66006143521261 is a wasteful number, since it uses less digits than its factorization.

66006143521261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347516.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 66006143521261 in words is "sixty-six trillion, six billion, one hundred forty-three million, five hundred twenty-one thousand, two hundred sixty-one".