66013045321 has 16 divisors (see below), whose sum is σ = 71868416400. Its totient is φ = 60398327808.

The previous prime is 66013045279. The next prime is 66013045337. The reversal of 66013045321 is 12354031066.

It can be written as a sum of positive squares in 8 ways, for example, as 9147966025 + 56865079296 = 95645^2 + 238464^2 .

It is a cyclic number.

It is not a de Polignac number, because 66013045321 - 2²¹ = 66010948169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013045121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237876 + ... + 434293.

It is an arithmetic number, because the mean of its divisors is an integer number (4491776025).

Almost surely, 2^66013045321 is an apocalyptic number.

It is an amenable number.

66013045321 is a deficient number, since it is larger than the sum of its proper divisors (5855371079).

66013045321 is a wasteful number, since it uses less digits than its factorization.

66013045321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672348.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 66013045321 its reverse (12354031066), we get a palindrome (78367076387).

The spelling of 66013045321 in words is "sixty-six billion, thirteen million, forty-five thousand, three hundred twenty-one".