25650264649 has 9 divisors (see below), whose sum is σ = 27250751541. Its totient is φ = 24138863040.

The previous prime is 25650264599. The next prime is 25650264707. The reversal of 25650264649 is 94646205652.

The square root of 25650264649 is 160157.

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 347636025 + 25302628624 = 18645^2 + 159068^2 .

It is not a de Polignac number, because 25650264649 - 2²¹ = 25648167497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25650264949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2717959 + ... + 2727379.

Almost surely, 2^25650264649 is an apocalyptic number.

25650264649 is the 160157-th square number.

25650264649 is the 80079-th centered octagonal number.

It is an amenable number.

25650264649 is a deficient number, since it is larger than the sum of its proper divisors (1600486892).

25650264649 is an frugal number, since it uses more digits than its factorization.

25650264649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18876 (or 9438 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

Multiplying 25650264649 by its sum of digits (49), we get a square (1256862967801 = 1121099²).

The spelling of 25650264649 in words is "twenty-five billion, six hundred fifty million, two hundred sixty-four thousand, six hundred forty-nine".