66631413666 has 32 divisors (see below), whose sum is σ = 141584005440. Its totient is φ = 20865007296.

The previous prime is 66631413661. The next prime is 66631413683.

66631413666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66631413666² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66631413661) 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 15 ways as a sum of consecutive naturals, for example, 5168416 + ... + 5181291.

It is an arithmetic number, because the mean of its divisors is an integer number (4424500170).

Almost surely, 2^66631413666 is an apocalyptic number.

66631413666 is an abundant number, since it is smaller than the sum of its proper divisors (74952591774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66631413666 is a wasteful number, since it uses less digits than its factorization.

66631413666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10349778.

The product of its digits is 1679616, while the sum is 48.

The spelling of 66631413666 in words is "sixty-six billion, six hundred thirty-one million, four hundred thirteen thousand, six hundred sixty-six".