66541242437 has 4 divisors (see below), whose sum is σ = 67452766380. Its totient is φ = 65629718496.

The previous prime is 66541242433. The next prime is 66541242451. The reversal of 66541242437 is 73424214566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53428473316 + 13112769121 = 231146^2 + 114511^2 .

It is a cyclic number.

It is not a de Polignac number, because 66541242437 - 2² = 66541242433 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66541242433) 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 3 ways as a sum of consecutive naturals, for example, 455761862 + ... + 455762007.

It is an arithmetic number, because the mean of its divisors is an integer number (16863191595).

Almost surely, 2^66541242437 is an apocalyptic number.

It is an amenable number.

66541242437 is a deficient number, since it is larger than the sum of its proper divisors (911523943).

66541242437 is an equidigital number, since it uses as much as digits as its factorization.

66541242437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911523942.

The product of its digits is 967680, while the sum is 44.

The spelling of 66541242437 in words is "sixty-six billion, five hundred forty-one million, two hundred forty-two thousand, four hundred thirty-seven".