61515044404213 has 2 divisors, whose sum is σ = 61515044404214. Its totient is φ = 61515044404212.

The previous prime is 61515044404201. The next prime is 61515044404241. The reversal of 61515044404213 is 31240444051516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33809317318084 + 27705727086129 = 5814578^2 + 5263623^2 .

It is a cyclic number.

It is not a de Polignac number, because 61515044404213 - 2³⁷ = 61377605450741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61515044404613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30757522202106 + 30757522202107.

It is an arithmetic number, because the mean of its divisors is an integer number (30757522202107).

Almost surely, 2^{61515044404213} is an apocalyptic number.

It is an amenable number.

61515044404213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61515044404213 is an equidigital number, since it uses as much as digits as its factorization.

61515044404213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 40.

Adding to 61515044404213 its reverse (31240444051516), we get a palindrome (92755488455729).

The spelling of 61515044404213 in words is "sixty-one trillion, five hundred fifteen billion, forty-four million, four hundred four thousand, two hundred thirteen".