3646820027138 has 18 divisors (see below), whose sum is σ = 5527602616923. Its totient is φ = 1804482339840.

The previous prime is 3646820027129. The next prime is 3646820027161. The reversal of 3646820027138 is 8317200286463.

It can be written as a sum of positive squares in 5 ways, for example, as 1978571384689 + 1668248642449 = 1406617^2 + 1291607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1350337.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261958418 + ... + 261972338.

Almost surely, 2^{3646820027138} is an apocalyptic number.

3646820027138 is a deficient number, since it is larger than the sum of its proper divisors (1880782589785).

3646820027138 is an frugal number, since it uses more digits than its factorization.

3646820027138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28038 (or 14020 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 50.

Multiplying 3646820027138 by its sum of digits (50), we get a square (182341001356900 = 13503370²).

The spelling of 3646820027138 in words is "three trillion, six hundred forty-six billion, eight hundred twenty million, twenty-seven thousand, one hundred thirty-eight".