66667788945 has 12 divisors (see below), whose sum is σ = 115557500916. Its totient is φ = 35556154080.

The previous prime is 66667788907. The next prime is 66667788949. The reversal of 66667788945 is 54988776666.

It can be written as a sum of positive squares in 2 ways, for example, as 35981157969 + 30686630976 = 189687^2 + 175176^2 .

It is not a de Polignac number, because 66667788945 - 2⁶ = 66667788881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66667788949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 740753166 + ... + 740753255.

It is an arithmetic number, because the mean of its divisors is an integer number (9629791743).

Almost surely, 2^66667788945 is an apocalyptic number.

It is an amenable number.

66667788945 is a deficient number, since it is larger than the sum of its proper divisors (48889711971).

66667788945 is a wasteful number, since it uses less digits than its factorization.

66667788945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481506432 (or 1481506429 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 72.

The spelling of 66667788945 in words is "sixty-six billion, six hundred sixty-seven million, seven hundred eighty-eight thousand, nine hundred forty-five".