25627750921 has 4 divisors (see below), whose sum is σ = 26511466500. Its totient is φ = 24744035344.

The previous prime is 25627750891. The next prime is 25627750927. The reversal of 25627750921 is 12905772652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4794870025 + 20832880896 = 69245^2 + 144336^2 .

It is a cyclic number.

It is not a de Polignac number, because 25627750921 - 2¹³ = 25627742729 is a prime.

It is a super-3 number, since 3×25627750921³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25627750927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441857746 + ... + 441857803.

It is an arithmetic number, because the mean of its divisors is an integer number (6627866625).

Almost surely, 2^25627750921 is an apocalyptic number.

It is an amenable number.

25627750921 is a deficient number, since it is larger than the sum of its proper divisors (883715579).

25627750921 is an equidigital number, since it uses as much as digits as its factorization.

25627750921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883715578.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 25627750921 in words is "twenty-five billion, six hundred twenty-seven million, seven hundred fifty thousand, nine hundred twenty-one".