66616650007 has 4 divisors (see below), whose sum is σ = 70535276496. Its totient is φ = 62698023520.

The previous prime is 66616649989. The next prime is 66616650011. The reversal of 66616650007 is 70005661666.

66616650007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66616650007 - 2¹¹ = 66616647959 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 (66616650097) 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, 1959313219 + ... + 1959313252.

It is an arithmetic number, because the mean of its divisors is an integer number (17633819124).

Almost surely, 2^66616650007 is an apocalyptic number.

66616650007 is a deficient number, since it is larger than the sum of its proper divisors (3918626489).

66616650007 is a wasteful number, since it uses less digits than its factorization.

66616650007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918626488.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 66616650007 in words is "sixty-six billion, six hundred sixteen million, six hundred fifty thousand, seven".