25094044921 has 9 divisors (see below), whose sum is σ = 27584625999. Its totient is φ = 22811184000.

The previous prime is 25094044853. The next prime is 25094044939. The reversal of 25094044921 is 12944049052.

The square root of 25094044921 is 158411.

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

It can be written as a sum of positive squares in only one way, i.e., 25087075321 + 6969600 = 158389^2 + 2640^2 .

It is not a de Polignac number, because 25094044921 - 2³¹ = 22946561273 is a prime.

It is a super-3 number, since 3×25094044921³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25094044121) 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, 1735321 + ... + 1749721.

Almost surely, 2^25094044921 is an apocalyptic number.

25094044921 is the 158411-st square number.

25094044921 is the 79206-th centered octagonal number.

It is an amenable number.

25094044921 is a deficient number, since it is larger than the sum of its proper divisors (2490581078).

25094044921 is an frugal number, since it uses more digits than its factorization.

25094044921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28824 (or 14412 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 25094044921 in words is "twenty-five billion, ninety-four million, forty-four thousand, nine hundred twenty-one".