64937425771973 has 2 divisors, whose sum is σ = 64937425771974. Its totient is φ = 64937425771972.

The previous prime is 64937425771969. The next prime is 64937425771993. The reversal of 64937425771973 is 37917752473946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51752959766209 + 13184466005764 = 7193953^2 + 3631042^2 .

It is a cyclic number.

It is not a de Polignac number, because 64937425771973 - 2² = 64937425771969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64937425771973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64937425771993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32468712885986 + 32468712885987.

It is an arithmetic number, because the mean of its divisors is an integer number (32468712885987).

Almost surely, 2^{64937425771973} is an apocalyptic number.

It is an amenable number.

64937425771973 is a deficient number, since it is larger than the sum of its proper divisors (1).

64937425771973 is an equidigital number, since it uses as much as digits as its factorization.

64937425771973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680315840, while the sum is 74.

The spelling of 64937425771973 in words is "sixty-four trillion, nine hundred thirty-seven billion, four hundred twenty-five million, seven hundred seventy-one thousand, nine hundred seventy-three".