61641517147939 has 2 divisors, whose sum is σ = 61641517147940. Its totient is φ = 61641517147938.

The previous prime is 61641517147901. The next prime is 61641517147957. The reversal of 61641517147939 is 93974171514616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61641517147939 - 2¹⁷ = 61641517016867 is a prime.

It is not a weakly prime, because it can be changed into another prime (61641517147739) 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, 30820758573969 + 30820758573970.

It is an arithmetic number, because the mean of its divisors is an integer number (30820758573970).

Almost surely, 2^{61641517147939} is an apocalyptic number.

61641517147939 is a deficient number, since it is larger than the sum of its proper divisors (1).

61641517147939 is an equidigital number, since it uses as much as digits as its factorization.

61641517147939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34292160, while the sum is 64.

The spelling of 61641517147939 in words is "sixty-one trillion, six hundred forty-one billion, five hundred seventeen million, one hundred forty-seven thousand, nine hundred thirty-nine".