66146642407 has 4 divisors (see below), whose sum is σ = 67231013656. Its totient is φ = 65062271160.

The previous prime is 66146642363. The next prime is 66146642413. The reversal of 66146642407 is 70424664166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70424664166 = 2 ⋅35212332083.

It is a cyclic number.

It is not a de Polignac number, because 66146642407 - 2¹⁹ = 66146118119 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 (66146642467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542185533 + ... + 542185654.

It is an arithmetic number, because the mean of its divisors is an integer number (16807753414).

Almost surely, 2^66146642407 is an apocalyptic number.

66146642407 is a deficient number, since it is larger than the sum of its proper divisors (1084371249).

66146642407 is a wasteful number, since it uses less digits than its factorization.

66146642407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084371248.

The product of its (nonzero) digits is 1161216, while the sum is 46.

The spelling of 66146642407 in words is "sixty-six billion, one hundred forty-six million, six hundred forty-two thousand, four hundred seven".