61423244551 has 2 divisors, whose sum is σ = 61423244552. Its totient is φ = 61423244550.

The previous prime is 61423244543. The next prime is 61423244599. The reversal of 61423244551 is 15544232416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61423244551 - 2³ = 61423244543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61423244551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61423244501) 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, 30711622275 + 30711622276.

It is an arithmetic number, because the mean of its divisors is an integer number (30711622276).

Almost surely, 2^61423244551 is an apocalyptic number.

61423244551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61423244551 is an equidigital number, since it uses as much as digits as its factorization.

61423244551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 37.

Adding to 61423244551 its reverse (15544232416), we get a palindrome (76967476967).

The spelling of 61423244551 in words is "sixty-one billion, four hundred twenty-three million, two hundred forty-four thousand, five hundred fifty-one".