3638546881 has 2 divisors, whose sum is σ = 3638546882. Its totient is φ = 3638546880.

The previous prime is 3638546843. The next prime is 3638546897. The reversal of 3638546881 is 1886458363.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2664108225 + 974438656 = 51615^2 + 31216^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638546881 - 2⁹ = 3638546369 is a prime.

It is a super-3 number, since 3×3638546881³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (3638546381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1819273440 + 1819273441.

It is an arithmetic number, because the mean of its divisors is an integer number (1819273441).

Almost surely, 2^3638546881 is an apocalyptic number.

It is an amenable number.

3638546881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638546881 is an equidigital number, since it uses as much as digits as its factorization.

3638546881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 52.

The square root of 3638546881 is about 60320.3687074275. The cubic root of 3638546881 is about 1538.0696115460.

The spelling of 3638546881 in words is "three billion, six hundred thirty-eight million, five hundred forty-six thousand, eight hundred eighty-one".