61339550391797 has 2 divisors, whose sum is σ = 61339550391798. Its totient is φ = 61339550391796.

The previous prime is 61339550391793. The next prime is 61339550391839. The reversal of 61339550391797 is 79719305593316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35132102890756 + 26207447501041 = 5927234^2 + 5119321^2 .

It is a cyclic number.

It is not a de Polignac number, because 61339550391797 - 2² = 61339550391793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61339550391793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30669775195898 + 30669775195899.

It is an arithmetic number, because the mean of its divisors is an integer number (30669775195899).

Almost surely, 2^{61339550391797} is an apocalyptic number.

It is an amenable number.

61339550391797 is a deficient number, since it is larger than the sum of its proper divisors (1).

61339550391797 is an equidigital number, since it uses as much as digits as its factorization.

61339550391797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144670050, while the sum is 68.

The spelling of 61339550391797 in words is "sixty-one trillion, three hundred thirty-nine billion, five hundred fifty million, three hundred ninety-one thousand, seven hundred ninety-seven".