61620163013 has 2 divisors, whose sum is σ = 61620163014. Its totient is φ = 61620163012.

The previous prime is 61620162979. The next prime is 61620163067. The reversal of 61620163013 is 31036102616.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42171908164 + 19448254849 = 205358^2 + 139457^2 .

It is a cyclic number.

It is not a de Polignac number, because 61620163013 - 2⁸ = 61620162757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61620163613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810081506 + 30810081507.

It is an arithmetic number, because the mean of its divisors is an integer number (30810081507).

Almost surely, 2^61620163013 is an apocalyptic number.

It is an amenable number.

61620163013 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620163013 is an equidigital number, since it uses as much as digits as its factorization.

61620163013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 61620163013 its reverse (31036102616), we get a palindrome (92656265629).

The spelling of 61620163013 in words is "sixty-one billion, six hundred twenty million, one hundred sixty-three thousand, thirteen".