61447991631073 has 2 divisors, whose sum is σ = 61447991631074. Its totient is φ = 61447991631072.

The previous prime is 61447991630969. The next prime is 61447991631101. The reversal of 61447991631073 is 37013619974416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35836122923584 + 25611868707489 = 5986328^2 + 5060817^2 .

It is a cyclic number.

It is not a de Polignac number, because 61447991631073 - 2⁹ = 61447991630561 is a prime.

It is not a weakly prime, because it can be changed into another prime (61447991631673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30723995815536 + 30723995815537.

It is an arithmetic number, because the mean of its divisors is an integer number (30723995815537).

Almost surely, 2^{61447991631073} is an apocalyptic number.

It is an amenable number.

61447991631073 is a deficient number, since it is larger than the sum of its proper divisors (1).

61447991631073 is an equidigital number, since it uses as much as digits as its factorization.

61447991631073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 61447991631073 in words is "sixty-one trillion, four hundred forty-seven billion, nine hundred ninety-one million, six hundred thirty-one thousand, seventy-three".