1640563914025 has 9 divisors (see below), whose sum is σ = 2034307194661. Its totient is φ = 1312446007840.

The previous prime is 1640563914023. The next prime is 1640563914029. The reversal of 1640563914025 is 5204193650461.

The square root of 1640563914025 is 1280845.

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 763951165849 + 876612748176 = 874043^2 + 936276^2 .

It is not a de Polignac number, because 1640563914025 - 2¹ = 1640563914023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640563914023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6276141 + ... + 6532309.

Almost surely, 2^{1640563914025} is an apocalyptic number.

1640563914025 is the 1280845-th square number.

1640563914025 is the 640423-rd centered octagonal number.

It is an amenable number.

1640563914025 is a deficient number, since it is larger than the sum of its proper divisors (393743280636).

1640563914025 is an frugal number, since it uses more digits than its factorization.

1640563914025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512348 (or 256174 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 1640563914025 in words is "one trillion, six hundred forty billion, five hundred sixty-three million, nine hundred fourteen thousand, twenty-five".