66407716737 has 6 divisors (see below), whose sum is σ = 95922257522. Its totient is φ = 44271811152.

The previous prime is 66407716729. The next prime is 66407716747. The reversal of 66407716737 is 73761770466.

It can be written as a sum of positive squares in only one way, i.e., 41404517361 + 25003199376 = 203481^2 + 158124^2 .

It is not a de Polignac number, because 66407716737 - 2³ = 66407716729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66407716747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3689317588 + ... + 3689317605.

Almost surely, 2^66407716737 is an apocalyptic number.

It is an amenable number.

66407716737 is a deficient number, since it is larger than the sum of its proper divisors (29514540785).

66407716737 is a wasteful number, since it uses less digits than its factorization.

66407716737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7378635199 (or 7378635196 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 54.

The spelling of 66407716737 in words is "sixty-six billion, four hundred seven million, seven hundred sixteen thousand, seven hundred thirty-seven".