66119661 has 12 divisors (see below), whose sum is σ = 95626492. Its totient is φ = 44024256.

The previous prime is 66119657. The next prime is 66119671. The reversal of 66119661 is 16691166.

It can be written as a sum of positive squares in 2 ways, for example, as 32421636 + 33698025 = 5694^2 + 5805^2 .

It is not a de Polignac number, because 66119661 - 2² = 66119657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66119671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3705 + ... + 12081.

Almost surely, 2^66119661 is an apocalyptic number.

It is an amenable number.

66119661 is a deficient number, since it is larger than the sum of its proper divisors (29506831).

66119661 is a wasteful number, since it uses less digits than its factorization.

66119661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9260 (or 9257 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 66119661 is about 8131.3996950095. The cubic root of 66119661 is about 404.3680863380.

The spelling of 66119661 in words is "sixty-six million, one hundred nineteen thousand, six hundred sixty-one".