66546399364566 has 32 divisors (see below), whose sum is σ = 145201464850176. Its totient is φ = 20164281012000.

The previous prime is 66546399364553. The next prime is 66546399364597.

It is a happy number.

66546399364566 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66546399364491 and 66546399364500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31327690 + ... + 33384381.

It is an arithmetic number, because the mean of its divisors is an integer number (4537545776568).

Almost surely, 2^{66546399364566} is an apocalyptic number.

66546399364566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66546399364566 is an abundant number, since it is smaller than the sum of its proper divisors (78655065485610).

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

66546399364566 is a wasteful number, since it uses less digits than its factorization.

66546399364566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64727668.

The product of its digits is 13604889600, while the sum is 78.

The spelling of 66546399364566 in words is "sixty-six trillion, five hundred forty-six billion, three hundred ninety-nine million, three hundred sixty-four thousand, five hundred sixty-six".