1639590616225 has 9 divisors (see below), whose sum is σ = 2033100303033. Its totient is φ = 1311667371120.

The previous prime is 1639590616217. The next prime is 1639590616247. The reversal of 1639590616225 is 5226160959361.

The square root of 1639590616225 is 1280465.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 910178965089 + 729411651136 = 954033^2 + 854056^2 .

It is not a de Polignac number, because 1639590616225 - 2³ = 1639590616217 is a prime.

It is a Duffinian 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, 6274279 + ... + 6530371.

Almost surely, 2^{1639590616225} is an apocalyptic number.

1639590616225 is the 1280465-th square number.

1639590616225 is the 640233-rd centered octagonal number.

It is an amenable number.

1639590616225 is a deficient number, since it is larger than the sum of its proper divisors (393509686808).

1639590616225 is an frugal number, since it uses more digits than its factorization.

1639590616225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512196 (or 256098 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 55.

The spelling of 1639590616225 in words is "one trillion, six hundred thirty-nine billion, five hundred ninety million, six hundred sixteen thousand, two hundred twenty-five".