66075068461 has 4 divisors (see below), whose sum is σ = 69961837212. Its totient is φ = 62188299712.

The previous prime is 66075068443. The next prime is 66075068467. The reversal of 66075068461 is 16486057066.

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 38374459236 + 27700609225 = 195894^2 + 166435^2 .

It is a cyclic number.

It is not a de Polignac number, because 66075068461 - 2¹⁵ = 66075035693 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 (66075068467) 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, 1943384350 + ... + 1943384383.

It is an arithmetic number, because the mean of its divisors is an integer number (17490459303).

Almost surely, 2^66075068461 is an apocalyptic number.

It is an amenable number.

66075068461 is a deficient number, since it is larger than the sum of its proper divisors (3886768751).

66075068461 is a wasteful number, since it uses less digits than its factorization.

66075068461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886768750.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 66075068461 in words is "sixty-six billion, seventy-five million, sixty-eight thousand, four hundred sixty-one".