66696829553 has 8 divisors (see below), whose sum is σ = 66842640480. Its totient is φ = 66551129280.

The previous prime is 66696829543. The next prime is 66696829567. The reversal of 66696829553 is 35592869666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66696829553 - 2²² = 66692635249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66696829553.

It is not an unprimeable number, because it can be changed into a prime (66696829543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1242218 + ... + 1294796.

It is an arithmetic number, because the mean of its divisors is an integer number (8355330060).

Almost surely, 2^66696829553 is an apocalyptic number.

It is an amenable number.

66696829553 is a deficient number, since it is larger than the sum of its proper divisors (145810927).

66696829553 is a wasteful number, since it uses less digits than its factorization.

66696829553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55327.

The product of its digits is 125971200, while the sum is 65.

The spelling of 66696829553 in words is "sixty-six billion, six hundred ninety-six million, eight hundred twenty-nine thousand, five hundred fifty-three".