66605616001 has 4 divisors (see below), whose sum is σ = 66621901104. Its totient is φ = 66589330900.

The previous prime is 66605615939. The next prime is 66605616013. The reversal of 66605616001 is 10061650666.

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 66605616001 - 2¹¹ = 66605613953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66605616601) 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, 8136415 + ... + 8144596.

It is an arithmetic number, because the mean of its divisors is an integer number (16655475276).

Almost surely, 2^66605616001 is an apocalyptic number.

It is an amenable number.

66605616001 is a deficient number, since it is larger than the sum of its proper divisors (16285103).

66605616001 is a wasteful number, since it uses less digits than its factorization.

66605616001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16285102.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 66605616001 in words is "sixty-six billion, six hundred five million, six hundred sixteen thousand, one".