66535406207 has 4 divisors (see below), whose sum is σ = 66574708200. Its totient is φ = 66496104216.

The previous prime is 66535406183. The next prime is 66535406209. The reversal of 66535406207 is 70260453566.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 66535406207 - 2¹⁶ = 66535340671 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 (66535406209) 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, 19648457 + ... + 19651842.

It is an arithmetic number, because the mean of its divisors is an integer number (16643677050).

Almost surely, 2^66535406207 is an apocalyptic number.

66535406207 is a deficient number, since it is larger than the sum of its proper divisors (39301993).

66535406207 is a wasteful number, since it uses less digits than its factorization.

66535406207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39301992.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 66535406207 in words is "sixty-six billion, five hundred thirty-five million, four hundred six thousand, two hundred seven".