66541703777 has 8 divisors (see below), whose sum is σ = 67942667520. Its totient is φ = 65155258080.

The previous prime is 66541703759. The next prime is 66541703801. The reversal of 66541703777 is 77730714566.

It is a happy number.

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 66541703777 - 2²² = 66537509473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66541703717) 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, 3620249 + ... + 3638582.

It is an arithmetic number, because the mean of its divisors is an integer number (8492833440).

Almost surely, 2^66541703777 is an apocalyptic number.

It is an amenable number.

66541703777 is a deficient number, since it is larger than the sum of its proper divisors (1400963743).

66541703777 is a wasteful number, since it uses less digits than its factorization.

66541703777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259023.

The product of its (nonzero) digits is 5186160, while the sum is 53.

The spelling of 66541703777 in words is "sixty-six billion, five hundred forty-one million, seven hundred three thousand, seven hundred seventy-seven".