61820267213 has 2 divisors, whose sum is σ = 61820267214. Its totient is φ = 61820267212.

The previous prime is 61820267143. The next prime is 61820267269. The reversal of 61820267213 is 31276202816.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44094540169 + 17725727044 = 209987^2 + 133138^2 .

It is a cyclic number.

It is not a de Polignac number, because 61820267213 - 2¹² = 61820263117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61820267293) 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 as a sum of consecutive naturals, namely, 30910133606 + 30910133607.

It is an arithmetic number, because the mean of its divisors is an integer number (30910133607).

Almost surely, 2^61820267213 is an apocalyptic number.

It is an amenable number.

61820267213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820267213 is an equidigital number, since it uses as much as digits as its factorization.

61820267213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 61820267213 in words is "sixty-one billion, eight hundred twenty million, two hundred sixty-seven thousand, two hundred thirteen".