61544336279 has 2 divisors, whose sum is σ = 61544336280. Its totient is φ = 61544336278.

The previous prime is 61544336233. The next prime is 61544336339. The reversal of 61544336279 is 97263344516.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61544336279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61544336879) 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, 30772168139 + 30772168140.

It is an arithmetic number, because the mean of its divisors is an integer number (30772168140).

Almost surely, 2^61544336279 is an apocalyptic number.

61544336279 is a deficient number, since it is larger than the sum of its proper divisors (1).

61544336279 is an equidigital number, since it uses as much as digits as its factorization.

61544336279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 50.

The spelling of 61544336279 in words is "sixty-one billion, five hundred forty-four million, three hundred thirty-six thousand, two hundred seventy-nine".