66236743601 has 4 divisors (see below), whose sum is σ = 75699135552. Its totient is φ = 56774351652.

The previous prime is 66236743597. The next prime is 66236743603. The reversal of 66236743601 is 10634763266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10634763266 = 2 ⋅5317381633.

It is a cyclic number.

It is not a de Polignac number, because 66236743601 - 2² = 66236743597 is a prime.

It is a super-2 number, since 2×66236743601² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66236743603) 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, 4731195965 + ... + 4731195978.

It is an arithmetic number, because the mean of its divisors is an integer number (18924783888).

Almost surely, 2^66236743601 is an apocalyptic number.

It is an amenable number.

66236743601 is a deficient number, since it is larger than the sum of its proper divisors (9462391951).

66236743601 is an equidigital number, since it uses as much as digits as its factorization.

66236743601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9462391950.

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 66236743601 in words is "sixty-six billion, two hundred thirty-six million, seven hundred forty-three thousand, six hundred one".