66124081321 has 6 divisors (see below), whose sum is σ = 67959521070. Its totient is φ = 64336942656.

The previous prime is 66124081307. The next prime is 66124081343. The reversal of 66124081321 is 12318042166.

It can be written as a sum of positive squares in 3 ways, for example, as 35244805696 + 30879275625 = 187736^2 + 175725^2 .

It is not a de Polignac number, because 66124081321 - 2⁹ = 66124080809 is a prime.

It is a super-2 number, since 2×66124081321² (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 (66124081021) 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 5 ways as a sum of consecutive naturals, for example, 24149136 + ... + 24151873.

It is an arithmetic number, because the mean of its divisors is an integer number (11326586845).

Almost surely, 2^66124081321 is an apocalyptic number.

It is an amenable number.

66124081321 is a deficient number, since it is larger than the sum of its proper divisors (1835439749).

66124081321 is an equidigital number, since it uses as much as digits as its factorization.

66124081321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48301083 (or 48301046 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 66124081321 in words is "sixty-six billion, one hundred twenty-four million, eighty-one thousand, three hundred twenty-one".