57721619370797 has 2 divisors, whose sum is σ = 57721619370798. Its totient is φ = 57721619370796.

The previous prime is 57721619370787. The next prime is 57721619370839. The reversal of 57721619370797 is 79707391612775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31669364022916 + 26052255347881 = 5627554^2 + 5104141^2 .

It is a cyclic number.

It is not a de Polignac number, because 57721619370797 - 2⁴⁰ = 56622107743021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57721619370797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57721619370787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28860809685398 + 28860809685399.

It is an arithmetic number, because the mean of its divisors is an integer number (28860809685399).

Almost surely, 2^{57721619370797} is an apocalyptic number.

It is an amenable number.

57721619370797 is a deficient number, since it is larger than the sum of its proper divisors (1).

57721619370797 is an equidigital number, since it uses as much as digits as its factorization.

57721619370797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 245046060, while the sum is 71.

The spelling of 57721619370797 in words is "fifty-seven trillion, seven hundred twenty-one billion, six hundred nineteen million, three hundred seventy thousand, seven hundred ninety-seven".