66000000077 has 4 divisors (see below), whose sum is σ = 72000000096. Its totient is φ = 60000000060.

The previous prime is 66000000067. The next prime is 66000000107. The reversal of 66000000077 is 77000000066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66000000077 - 2⁶ = 66000000013 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 65999999992 and 66000000055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000000067) 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, 2999999993 + ... + 3000000014.

It is an arithmetic number, because the mean of its divisors is an integer number (18000000024).

Almost surely, 2^66000000077 is an apocalyptic number.

It is an amenable number.

66000000077 is a deficient number, since it is larger than the sum of its proper divisors (6000000019).

66000000077 is a wasteful number, since it uses less digits than its factorization.

66000000077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000000018.

The product of its (nonzero) digits is 1764, while the sum is 26.

The spelling of 66000000077 in words is "sixty-six billion, seventy-seven", and thus it is an aban number and an uban number.