66666670005 has 32 divisors (see below), whose sum is σ = 114885227520. Its totient is φ = 32816678400.

The previous prime is 66666669983. The next prime is 66666670027. The reversal of 66666670005 is 50007666666.

It is an interprime number because it is at equal distance from previous prime (66666669983) and next prime (66666670027).

It is not a de Polignac number, because 66666670005 - 2¹² = 66666665909 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2405980 + ... + 2433530.

It is an arithmetic number, because the mean of its divisors is an integer number (3590163360).

Almost surely, 2^66666670005 is an apocalyptic number.

66666670005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66666670005 is a deficient number, since it is larger than the sum of its proper divisors (48218557515).

66666670005 is a wasteful number, since it uses less digits than its factorization.

66666670005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39981.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 66666670005 in words is "sixty-six billion, six hundred sixty-six million, six hundred seventy thousand, five".