66731264747 has 4 divisors (see below), whose sum is σ = 76264302576. Its totient is φ = 57198226920.

The previous prime is 66731264741. The next prime is 66731264749. The reversal of 66731264747 is 74746213766.

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 66731264747 - 2⁸ = 66731264491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66731264741) 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, 4766518904 + ... + 4766518917.

It is an arithmetic number, because the mean of its divisors is an integer number (19066075644).

Almost surely, 2^66731264747 is an apocalyptic number.

66731264747 is a deficient number, since it is larger than the sum of its proper divisors (9533037829).

66731264747 is an equidigital number, since it uses as much as digits as its factorization.

66731264747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9533037828.

The product of its digits is 7112448, while the sum is 53.

The spelling of 66731264747 in words is "sixty-six billion, seven hundred thirty-one million, two hundred sixty-four thousand, seven hundred forty-seven".