52028644791581 has 2 divisors, whose sum is σ = 52028644791582. Its totient is φ = 52028644791580.

The previous prime is 52028644791559. The next prime is 52028644791623. The reversal of 52028644791581 is 18519744682025.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50912991291556 + 1115653500025 = 7135334^2 + 1056245^2 .

It is a cyclic number.

It is not a de Polignac number, because 52028644791581 - 2¹⁰ = 52028644790557 is a prime.

It is a super-2 number, since 2×52028644791581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52028644791881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26014322395790 + 26014322395791.

It is an arithmetic number, because the mean of its divisors is an integer number (26014322395791).

Almost surely, 2^{52028644791581} is an apocalyptic number.

It is an amenable number.

52028644791581 is a deficient number, since it is larger than the sum of its proper divisors (1).

52028644791581 is an equidigital number, since it uses as much as digits as its factorization.

52028644791581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 52028644791581 in words is "fifty-two trillion, twenty-eight billion, six hundred forty-four million, seven hundred ninety-one thousand, five hundred eighty-one".