66401062417 has 4 divisors (see below), whose sum is σ = 67147141860. Its totient is φ = 65654982976.

The previous prime is 66401062393. The next prime is 66401062423. The reversal of 66401062417 is 71426010466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71426010466 = 2 ⋅35713005233.

It can be written as a sum of positive squares in 2 ways, for example, as 14942862081 + 51458200336 = 122241^2 + 226844^2 .

It is a cyclic number.

It is not a de Polignac number, because 66401062417 - 2¹⁵ = 66401029649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66401062457) 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, 373039588 + ... + 373039765.

It is an arithmetic number, because the mean of its divisors is an integer number (16786785465).

Almost surely, 2^66401062417 is an apocalyptic number.

It is an amenable number.

66401062417 is a deficient number, since it is larger than the sum of its proper divisors (746079443).

66401062417 is an equidigital number, since it uses as much as digits as its factorization.

66401062417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746079442.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 66401062417 in words is "sixty-six billion, four hundred one million, sixty-two thousand, four hundred seventeen".