66153326634021 has 64 divisors (see below), whose sum is σ = 97283030261760. Its totient is φ = 39652542056640.

The previous prime is 66153326634019. The next prime is 66153326634077. The reversal of 66153326634021 is 12043662335166.

It is not a de Polignac number, because 66153326634021 - 2¹ = 66153326634019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66153326636021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9133411626 + ... + 9133418868.

It is an arithmetic number, because the mean of its divisors is an integer number (1520047347840).

Almost surely, 2^{66153326634021} is an apocalyptic number.

It is an amenable number.

66153326634021 is a deficient number, since it is larger than the sum of its proper divisors (31129703627739).

66153326634021 is a wasteful number, since it uses less digits than its factorization.

66153326634021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11286.

The product of its (nonzero) digits is 2799360, while the sum is 48.

Adding to 66153326634021 its reverse (12043662335166), we get a palindrome (78196988969187).

The spelling of 66153326634021 in words is "sixty-six trillion, one hundred fifty-three billion, three hundred twenty-six million, six hundred thirty-four thousand, twenty-one".