57020621761 has 2 divisors, whose sum is σ = 57020621762. Its totient is φ = 57020621760.

The previous prime is 57020621747. The next prime is 57020621767. The reversal of 57020621761 is 16712602075.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31172021136 + 25848600625 = 176556^2 + 160775^2 .

It is a cyclic number.

It is not a de Polignac number, because 57020621761 - 2⁵ = 57020621729 is a prime.

It is a super-2 number, since 2×57020621761² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 57020621761.

It is not a weakly prime, because it can be changed into another prime (57020621767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28510310880 + 28510310881.

It is an arithmetic number, because the mean of its divisors is an integer number (28510310881).

Almost surely, 2^57020621761 is an apocalyptic number.

It is an amenable number.

57020621761 is a deficient number, since it is larger than the sum of its proper divisors (1).

57020621761 is an equidigital number, since it uses as much as digits as its factorization.

57020621761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 57020621761 in words is "fifty-seven billion, twenty million, six hundred twenty-one thousand, seven hundred sixty-one".