66677599577666 has 32 divisors (see below), whose sum is σ = 126556901563392. Its totient is φ = 25590549940560.

The previous prime is 66677599577663. The next prime is 66677599577669.

66677599577666 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66677599577663) and next prime (66677599577669).

It is not an unprimeable number, because it can be changed into a prime (66677599577663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3231119726 + ... + 3231140361.

It is an arithmetic number, because the mean of its divisors is an integer number (3954903173856).

Almost surely, 2^{66677599577666} is an apocalyptic number.

66677599577666 is a deficient number, since it is larger than the sum of its proper divisors (59879301985726).

66677599577666 is a wasteful number, since it uses less digits than its factorization.

66677599577666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6462260174.

The product of its digits is 226842638400, while the sum is 92.

The spelling of 66677599577666 in words is "sixty-six trillion, six hundred seventy-seven billion, five hundred ninety-nine million, five hundred seventy-seven thousand, six hundred sixty-six".