66206151601 has 4 divisors (see below), whose sum is σ = 66316680000. Its totient is φ = 66095623204.

The previous prime is 66206151593. The next prime is 66206151629. The reversal of 66206151601 is 10615160266.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10615160266 = 2 ⋅5307580133.

It is a cyclic number.

It is not a de Polignac number, because 66206151601 - 2³ = 66206151593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66206151001) 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, 55263301 + ... + 55264498.

It is an arithmetic number, because the mean of its divisors is an integer number (16579170000).

Almost surely, 2^66206151601 is an apocalyptic number.

It is an amenable number.

66206151601 is a deficient number, since it is larger than the sum of its proper divisors (110528399).

66206151601 is a wasteful number, since it uses less digits than its factorization.

66206151601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110528398.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 66206151601 in words is "sixty-six billion, two hundred six million, one hundred fifty-one thousand, six hundred one".