66291397351 has 4 divisors (see below), whose sum is σ = 66322802304. Its totient is φ = 66259992400.

The previous prime is 66291397349. The next prime is 66291397373. The reversal of 66291397351 is 15379319266.

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 66291397351 - 2¹ = 66291397349 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 (66291307351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15699310 + ... + 15703531.

It is an arithmetic number, because the mean of its divisors is an integer number (16580700576).

Almost surely, 2^66291397351 is an apocalyptic number.

66291397351 is a deficient number, since it is larger than the sum of its proper divisors (31404953).

66291397351 is a wasteful number, since it uses less digits than its factorization.

66291397351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31404952.

The product of its digits is 1837080, while the sum is 52.

The spelling of 66291397351 in words is "sixty-six billion, two hundred ninety-one million, three hundred ninety-seven thousand, three hundred fifty-one".