61644942743 has 2 divisors, whose sum is σ = 61644942744. Its totient is φ = 61644942742.

The previous prime is 61644942703. The next prime is 61644942757. The reversal of 61644942743 is 34724944616.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61644942743 - 2¹⁴ = 61644926359 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 61644942691 and 61644942700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61644942703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30822471371 + 30822471372.

It is an arithmetic number, because the mean of its divisors is an integer number (30822471372).

Almost surely, 2^61644942743 is an apocalyptic number.

61644942743 is a deficient number, since it is larger than the sum of its proper divisors (1).

61644942743 is an equidigital number, since it uses as much as digits as its factorization.

61644942743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 50.

The spelling of 61644942743 in words is "sixty-one billion, six hundred forty-four million, nine hundred forty-two thousand, seven hundred forty-three".