66661262305 has 16 divisors (see below), whose sum is σ = 87277025664. Its totient is φ = 48474599680.

The previous prime is 66661262299. The next prime is 66661262341. The reversal of 66661262305 is 50326216666.

It is not a de Polignac number, because 66661262305 - 2¹¹ = 66661260257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369849 + ... + 519721.

It is an arithmetic number, because the mean of its divisors is an integer number (5454814104).

Almost surely, 2^66661262305 is an apocalyptic number.

It is an amenable number.

66661262305 is a deficient number, since it is larger than the sum of its proper divisors (20615763359).

66661262305 is a wasteful number, since it uses less digits than its factorization.

66661262305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157976.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 66661262305 in words is "sixty-six billion, six hundred sixty-one million, two hundred sixty-two thousand, three hundred five".