7625138257 has 4 divisors (see below), whose sum is σ = 8318332656. Its totient is φ = 6931943860.

The previous prime is 7625138243. The next prime is 7625138267. The reversal of 7625138257 is 7528315267.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7625138257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7625138237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346597183 + ... + 346597204.

It is an arithmetic number, because the mean of its divisors is an integer number (2079583164).

Almost surely, 2^7625138257 is an apocalyptic number.

It is an amenable number.

7625138257 is a deficient number, since it is larger than the sum of its proper divisors (693194399).

7625138257 is a wasteful number, since it uses less digits than its factorization.

7625138257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693194398.

The product of its digits is 705600, while the sum is 46.

The square root of 7625138257 is about 87322.0376365554. The cubic root of 7625138257 is about 1968.2604876167.

The spelling of 7625138257 in words is "seven billion, six hundred twenty-five million, one hundred thirty-eight thousand, two hundred fifty-seven".