66893438351 has 16 divisors (see below), whose sum is σ = 68802539520. Its totient is φ = 65001303360.

The previous prime is 66893438341. The next prime is 66893438387. The reversal of 66893438351 is 15383439866.

It is a cyclic number.

It is not a de Polignac number, because 66893438351 - 2²⁶ = 66826329487 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66893438341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6730856 + ... + 6740786.

It is an arithmetic number, because the mean of its divisors is an integer number (4300158720).

Almost surely, 2^66893438351 is an apocalyptic number.

66893438351 is a deficient number, since it is larger than the sum of its proper divisors (1909101169).

66893438351 is a wasteful number, since it uses less digits than its factorization.

66893438351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766.

The product of its digits is 11197440, while the sum is 56.

The spelling of 66893438351 in words is "sixty-six billion, eight hundred ninety-three million, four hundred thirty-eight thousand, three hundred fifty-one".