66601335500443 has 4 divisors (see below), whose sum is σ = 67403761229448. Its totient is φ = 65798909771440.

The previous prime is 66601335500437. The next prime is 66601335500591. The reversal of 66601335500443 is 34400553310666.

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

It is a cyclic number.

It is not a de Polignac number, because 66601335500443 - 2²⁹ = 66600798629531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66601335500393 and 66601335500402.

It is not an unprimeable number, because it can be changed into a prime (66601335504443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401212864378 + ... + 401212864543.

It is an arithmetic number, because the mean of its divisors is an integer number (16850940307362).

Almost surely, 2^{66601335500443} is an apocalyptic number.

66601335500443 is a deficient number, since it is larger than the sum of its proper divisors (802425729005).

66601335500443 is an equidigital number, since it uses as much as digits as its factorization.

66601335500443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802425729004.

The product of its (nonzero) digits is 2332800, while the sum is 46.

The spelling of 66601335500443 in words is "sixty-six trillion, six hundred one billion, three hundred thirty-five million, five hundred thousand, four hundred forty-three".