2525630721 has 16 divisors (see below), whose sum is σ = 3587482944. Its totient is φ = 1574982144.

The previous prime is 2525630699. The next prime is 2525630813. The reversal of 2525630721 is 1270365252.

It is not a de Polignac number, because 2525630721 - 2¹³ = 2525622529 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2525630221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143596 + ... + 160221.

It is an arithmetic number, because the mean of its divisors is an integer number (224217684).

Almost surely, 2^2525630721 is an apocalyptic number.

It is an amenable number.

2525630721 is a deficient number, since it is larger than the sum of its proper divisors (1061852223).

2525630721 is a wasteful number, since it uses less digits than its factorization.

2525630721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304000.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 2525630721 is about 50255.6536222543. The cubic root of 2525630721 is about 1361.8312127364.

Adding to 2525630721 its reverse (1270365252), we get a palindrome (3795995973).

The spelling of 2525630721 in words is "two billion, five hundred twenty-five million, six hundred thirty thousand, seven hundred twenty-one".