66632402077 has 4 divisors (see below), whose sum is σ = 66634558396. Its totient is φ = 66630245760.

The previous prime is 66632402029. The next prime is 66632402087. The reversal of 66632402077 is 77020423666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77020423666 = 2 ⋅38510211833.

It can be written as a sum of positive squares in 2 ways, for example, as 42959194756 + 23673207321 = 207266^2 + 153861^2 .

It is a cyclic number.

It is not a de Polignac number, because 66632402077 - 2²⁷ = 66498184349 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 (66632402087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031124 + ... + 1093837.

It is an arithmetic number, because the mean of its divisors is an integer number (16658639599).

Almost surely, 2^66632402077 is an apocalyptic number.

It is an amenable number.

66632402077 is a deficient number, since it is larger than the sum of its proper divisors (2156319).

66632402077 is a wasteful number, since it uses less digits than its factorization.

66632402077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156318.

The product of its (nonzero) digits is 508032, while the sum is 43.

The spelling of 66632402077 in words is "sixty-six billion, six hundred thirty-two million, four hundred two thousand, seventy-seven".