66201623347 has 4 divisors (see below), whose sum is σ = 68337159616. Its totient is φ = 64066087080.

The previous prime is 66201623291. The next prime is 66201623393. The reversal of 66201623347 is 74332610266.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66201623347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66201623447) 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, 1067768088 + ... + 1067768149.

It is an arithmetic number, because the mean of its divisors is an integer number (17084289904).

Almost surely, 2^66201623347 is an apocalyptic number.

66201623347 is a deficient number, since it is larger than the sum of its proper divisors (2135536269).

66201623347 is a wasteful number, since it uses less digits than its factorization.

66201623347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135536268.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 66201623347 in words is "sixty-six billion, two hundred one million, six hundred twenty-three thousand, three hundred forty-seven".