1638614164 has 12 divisors (see below), whose sum is σ = 3128263488. Its totient is φ = 744824600.

The previous prime is 1638614161. The next prime is 1638614167. The reversal of 1638614164 is 4614168361.

It is an interprime number because it is at equal distance from previous prime (1638614161) and next prime (1638614167).

It is a super-2 number, since 2×1638614164² = 5370112756922837792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638614161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18620572 + ... + 18620659.

It is an arithmetic number, because the mean of its divisors is an integer number (260688624).

Almost surely, 2^1638614164 is an apocalyptic number.

It is an amenable number.

1638614164 is a deficient number, since it is larger than the sum of its proper divisors (1489649324).

1638614164 is a wasteful number, since it uses less digits than its factorization.

1638614164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37241246 (or 37241244 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 1638614164 is about 40479.7994560250. The cubic root of 1638614164 is about 1178.9414436630.

The spelling of 1638614164 in words is "one billion, six hundred thirty-eight million, six hundred fourteen thousand, one hundred sixty-four".