66013732686 has 32 divisors (see below), whose sum is σ = 144162135936. Its totient is φ = 19985804000.

The previous prime is 66013732649. The next prime is 66013732709. The reversal of 66013732686 is 68623731066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386385 + ... + 530396.

It is an arithmetic number, because the mean of its divisors is an integer number (4505066748).

Almost surely, 2^66013732686 is an apocalyptic number.

66013732686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66013732686 is an abundant number, since it is smaller than the sum of its proper divisors (78148403250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66013732686 is a wasteful number, since it uses less digits than its factorization.

66013732686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917888.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 66013732686 in words is "sixty-six billion, thirteen million, seven hundred thirty-two thousand, six hundred eighty-six".