66637471627651 has 4 divisors (see below), whose sum is σ = 66638134042992. Its totient is φ = 66636809212312.

The previous prime is 66637471627633. The next prime is 66637471627673. The reversal of 66637471627651 is 15672617473666.

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 66637471627651 - 2²⁹ = 66636934756739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66637471657651) 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, 331056751 + ... + 331257976.

It is an arithmetic number, because the mean of its divisors is an integer number (16659533510748).

Almost surely, 2^{66637471627651} is an apocalyptic number.

66637471627651 is a deficient number, since it is larger than the sum of its proper divisors (662415341).

66637471627651 is a wasteful number, since it uses less digits than its factorization.

66637471627651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662415340.

The product of its digits is 320060160, while the sum is 67.

The spelling of 66637471627651 in words is "sixty-six trillion, six hundred thirty-seven billion, four hundred seventy-one million, six hundred twenty-seven thousand, six hundred fifty-one".