66751417071 has 6 divisors (see below), whose sum is σ = 96418713560. Its totient is φ = 44500944708.

The previous prime is 66751417021. The next prime is 66751417079. The reversal of 66751417071 is 17071415766.

It is a happy number.

66751417071 is a `hidden beast` number, since 6 + 67 + 514 + 1 + 7 + 0 + 71 = 666.

It is not a de Polignac number, because 66751417071 - 2¹¹ = 66751415023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66751417079) 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, 3708412051 + ... + 3708412068.

Almost surely, 2^66751417071 is an apocalyptic number.

66751417071 is a deficient number, since it is larger than the sum of its proper divisors (29667296489).

66751417071 is a wasteful number, since it uses less digits than its factorization.

66751417071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416824125 (or 7416824122 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 66751417071 in words is "sixty-six billion, seven hundred fifty-one million, four hundred seventeen thousand, seventy-one".