2638671425 has 24 divisors (see below), whose sum is σ = 3527300280. Its totient is φ = 1946534400.

The previous prime is 2638671421. The next prime is 2638671433. The reversal of 2638671425 is 5241768362.

2638671425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 51368²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 2596004401 + 42667024 = 50951^2 + 6532^2 .

It is not a de Polignac number, because 2638671425 - 2² = 2638671421 is a prime.

It is a super-2 number, since 2×2638671425² = 13925173778223061250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2638671421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356765 + ... + 364085.

It is an arithmetic number, because the mean of its divisors is an integer number (146970845).

Almost surely, 2^2638671425 is an apocalyptic number.

2638671425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2638671425 is a deficient number, since it is larger than the sum of its proper divisors (888628855).

2638671425 is a wasteful number, since it uses less digits than its factorization.

2638671425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8453 (or 8448 counting only the distinct ones).

The product of its digits is 483840, while the sum is 44.

The square root of 2638671425 is about 51368.0000097337. Note that the first 5 decimals coincide. The cubic root of 2638671425 is about 1381.8527632729.

The spelling of 2638671425 in words is "two billion, six hundred thirty-eight million, six hundred seventy-one thousand, four hundred twenty-five".