66437531441 has 4 divisors (see below), whose sum is σ = 67095328884. Its totient is φ = 65779734000.

The previous prime is 66437531393. The next prime is 66437531471. The reversal of 66437531441 is 14413573466.

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 52020486400 + 14417045041 = 228080^2 + 120071^2 .

It is a cyclic number.

It is not a de Polignac number, because 66437531441 - 2²⁶ = 66370422577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66437531392 and 66437531401.

It is not an unprimeable number, because it can be changed into a prime (66437531471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328898570 + ... + 328898771.

It is an arithmetic number, because the mean of its divisors is an integer number (16773832221).

Almost surely, 2^66437531441 is an apocalyptic number.

It is an amenable number.

66437531441 is a deficient number, since it is larger than the sum of its proper divisors (657797443).

66437531441 is a wasteful number, since it uses less digits than its factorization.

66437531441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657797442.

The product of its digits is 725760, while the sum is 44.

The spelling of 66437531441 in words is "sixty-six billion, four hundred thirty-seven million, five hundred thirty-one thousand, four hundred forty-one".