633256020581 has 2 divisors, whose sum is σ = 633256020582. Its totient is φ = 633256020580.

The previous prime is 633256020521. The next prime is 633256020613. The reversal of 633256020581 is 185020652336.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608697996481 + 24558024100 = 780191^2 + 156710^2 .

It is a cyclic number.

It is not a de Polignac number, because 633256020581 - 2⁶ = 633256020517 is a prime.

It is a super-2 number, since 2×633256020581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633256020521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316628010290 + 316628010291.

It is an arithmetic number, because the mean of its divisors is an integer number (316628010291).

Almost surely, 2^633256020581 is an apocalyptic number.

It is an amenable number.

633256020581 is a deficient number, since it is larger than the sum of its proper divisors (1).

633256020581 is an equidigital number, since it uses as much as digits as its factorization.

633256020581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 633256020581 in words is "six hundred thirty-three billion, two hundred fifty-six million, twenty thousand, five hundred eighty-one".