66206151599 has 6 divisors (see below), whose sum is σ = 77015319264. Its totient is φ = 56748129900.

The previous prime is 66206151593. The next prime is 66206151629. The reversal of 66206151599 is 99515160266.

It is a happy number.

It is not a de Polignac number, because 66206151599 - 2³² = 61911184303 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 (66206151593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 675572927 + ... + 675573024.

It is an arithmetic number, because the mean of its divisors is an integer number (12835886544).

Almost surely, 2^66206151599 is an apocalyptic number.

66206151599 is a deficient number, since it is larger than the sum of its proper divisors (10809167665).

66206151599 is a wasteful number, since it uses less digits than its factorization.

66206151599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351145965 (or 1351145958 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 66206151599 in words is "sixty-six billion, two hundred six million, one hundred fifty-one thousand, five hundred ninety-nine".