66017215393 has 4 divisors (see below), whose sum is σ = 66026595888. Its totient is φ = 66007834900.

The previous prime is 66017215351. The next prime is 66017215403. The reversal of 66017215393 is 39351271066.

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: 39351271066 = 2 ⋅19675635533.

It is a cyclic number.

It is not a de Polignac number, because 66017215393 - 2²⁹ = 65480344481 is a prime.

It is a super-2 number, since 2×66017215393² (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 (66017215343) 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, 4679683 + ... + 4693768.

It is an arithmetic number, because the mean of its divisors is an integer number (16506648972).

Almost surely, 2^66017215393 is an apocalyptic number.

It is an amenable number.

66017215393 is a deficient number, since it is larger than the sum of its proper divisors (9380495).

66017215393 is an equidigital number, since it uses as much as digits as its factorization.

66017215393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9380494.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 66017215393 in words is "sixty-six billion, seventeen million, two hundred fifteen thousand, three hundred ninety-three".