1638886057 has 2 divisors, whose sum is σ = 1638886058. Its totient is φ = 1638886056.

The previous prime is 1638886049. The next prime is 1638886069. The reversal of 1638886057 is 7506888361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1292330601 + 346555456 = 35949^2 + 18616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1638886057 - 2³ = 1638886049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1638885995 and 1638886013.

It is not a weakly prime, because it can be changed into another prime (1638886027) 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, 819443028 + 819443029.

It is an arithmetic number, because the mean of its divisors is an integer number (819443029).

Almost surely, 2^1638886057 is an apocalyptic number.

It is an amenable number.

1638886057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638886057 is an equidigital number, since it uses as much as digits as its factorization.

1638886057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The square root of 1638886057 is about 40483.1576955158. The cubic root of 1638886057 is about 1179.0066467689.

The spelling of 1638886057 in words is "one billion, six hundred thirty-eight million, eight hundred eighty-six thousand, fifty-seven".