66686737443 has 8 divisors (see below), whose sum is σ = 90041164800. Its totient is φ = 43895067528.

The previous prime is 66686737421. The next prime is 66686737489. The reversal of 66686737443 is 34473768666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66686737443 - 2¹³ = 66686729251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66686737493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140689083 + ... + 140689556.

It is an arithmetic number, because the mean of its divisors is an integer number (11255145600).

Almost surely, 2^66686737443 is an apocalyptic number.

66686737443 is a deficient number, since it is larger than the sum of its proper divisors (23354427357).

66686737443 is a wasteful number, since it uses less digits than its factorization.

66686737443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281378721.

The product of its digits is 73156608, while the sum is 60.

The spelling of 66686737443 in words is "sixty-six billion, six hundred eighty-six million, seven hundred thirty-seven thousand, four hundred forty-three".