66373341661 has 4 divisors (see below), whose sum is σ = 72407281824. Its totient is φ = 60339401500.

The previous prime is 66373341637. The next prime is 66373341667. The reversal of 66373341661 is 16614337366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66373341661 - 2⁹ = 66373341149 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 (66373341667) 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, 3016970065 + ... + 3016970086.

It is an arithmetic number, because the mean of its divisors is an integer number (18101820456).

Almost surely, 2^66373341661 is an apocalyptic number.

It is an amenable number.

66373341661 is a deficient number, since it is larger than the sum of its proper divisors (6033940163).

66373341661 is a wasteful number, since it uses less digits than its factorization.

66373341661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6033940162.

The product of its digits is 979776, while the sum is 46.

The spelling of 66373341661 in words is "sixty-six billion, three hundred seventy-three million, three hundred forty-one thousand, six hundred sixty-one".