66013732687 has 4 divisors (see below), whose sum is σ = 75444265936. Its totient is φ = 56583199440.

The previous prime is 66013732649. The next prime is 66013732709. The reversal of 66013732687 is 78623731066.

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 66013732687 - 2⁷ = 66013732559 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 66013732687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66013732627) 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, 4715266614 + ... + 4715266627.

It is an arithmetic number, because the mean of its divisors is an integer number (18861066484).

Almost surely, 2^66013732687 is an apocalyptic number.

66013732687 is a deficient number, since it is larger than the sum of its proper divisors (9430533249).

66013732687 is an equidigital number, since it uses as much as digits as its factorization.

66013732687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9430533248.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 66013732687 in words is "sixty-six billion, thirteen million, seven hundred thirty-two thousand, six hundred eighty-seven".