66666677895 has 24 divisors (see below), whose sum is σ = 115634890800. Its totient is φ = 35531156736.

The previous prime is 66666677843. The next prime is 66666677939. The reversal of 66666677895 is 59877666666.

66666677895 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66666677895 - 2¹⁰ = 66666676871 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442050 + ... + 573359.

It is an arithmetic number, because the mean of its divisors is an integer number (4818120450).

Almost surely, 2^66666677895 is an apocalyptic number.

66666677895 is a deficient number, since it is larger than the sum of its proper divisors (48968212905).

66666677895 is a wasteful number, since it uses less digits than its factorization.

66666677895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016879 (or 1016876 counting only the distinct ones).

The product of its digits is 823011840, while the sum is 72.

The spelling of 66666677895 in words is "sixty-six billion, six hundred sixty-six million, six hundred seventy-seven thousand, eight hundred ninety-five".