61339550399989 has 2 divisors, whose sum is σ = 61339550399990. Its totient is φ = 61339550399988.

The previous prime is 61339550399971. The next prime is 61339550400017. The reversal of 61339550399989 is 98999305593316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50975387487025 + 10364162912964 = 7139705^2 + 3219342^2 .

It is a cyclic number.

It is not a de Polignac number, because 61339550399989 - 2¹³ = 61339550391797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61339550399689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30669775199994 + 30669775199995.

It is an arithmetic number, because the mean of its divisors is an integer number (30669775199995).

Almost surely, 2^{61339550399989} is an apocalyptic number.

It is an amenable number.

61339550399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61339550399989 is an equidigital number, since it uses as much as digits as its factorization.

61339550399989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1913187600, while the sum is 79.

The spelling of 61339550399989 in words is "sixty-one trillion, three hundred thirty-nine billion, five hundred fifty million, three hundred ninety-nine thousand, nine hundred eighty-nine".