61442577643 has 2 divisors, whose sum is σ = 61442577644. Its totient is φ = 61442577642.

The previous prime is 61442577611. The next prime is 61442577661. The reversal of 61442577643 is 34677524416.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61442577643 - 2⁵ = 61442577611 is a prime.

It is not a weakly prime, because it can be changed into another prime (61442577673) 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, 30721288821 + 30721288822.

It is an arithmetic number, because the mean of its divisors is an integer number (30721288822).

Almost surely, 2^61442577643 is an apocalyptic number.

61442577643 is a deficient number, since it is larger than the sum of its proper divisors (1).

61442577643 is an equidigital number, since it uses as much as digits as its factorization.

61442577643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 49.

The spelling of 61442577643 in words is "sixty-one billion, four hundred forty-two million, five hundred seventy-seven thousand, six hundred forty-three".