1640896950625 has 15 divisors (see below), whose sum is σ = 2050504847941. Its totient is φ = 1312691941000.

The previous prime is 1640896950593. The next prime is 1640896950631. The reversal of 1640896950625 is 5260596980461.

The square root of 1640896950625 is 1280975.

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

It can be written as a sum of positive squares in 2 ways, for example, as 128646320929 + 1512250629696 = 358673^2 + 1229736^2 .

It is not a de Polignac number, because 1640896950625 - 2⁵ = 1640896950593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 31998756 + ... + 32049994.

Almost surely, 2^{1640896950625} is an apocalyptic number.

1640896950625 is the 1280975-th square number.

1640896950625 is the 640488-th centered octagonal number.

It is an amenable number.

1640896950625 is a deficient number, since it is larger than the sum of its proper divisors (409607897316).

1640896950625 is an frugal number, since it uses more digits than its factorization.

1640896950625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102498 (or 51244 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 1640896950625 in words is "one trillion, six hundred forty billion, eight hundred ninety-six million, nine hundred fifty thousand, six hundred twenty-five".