7688625137 has 4 divisors (see below), whose sum is σ = 7688823780. Its totient is φ = 7688426496.

The previous prime is 7688625121. The next prime is 7688625149. The reversal of 7688625137 is 7315268867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7315268867 = 191 ⋅38299837.

It can be written as a sum of positive squares in 2 ways, for example, as 2770548496 + 4918076641 = 52636^2 + 70129^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688625137 - 2⁴ = 7688625121 is a prime.

It is a super-2 number, since 2×7688625137² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7688625107) 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, 20312 + ... + 125657.

It is an arithmetic number, because the mean of its divisors is an integer number (1922205945).

Almost surely, 2^7688625137 is an apocalyptic number.

It is an amenable number.

7688625137 is a deficient number, since it is larger than the sum of its proper divisors (198643).

7688625137 is a wasteful number, since it uses less digits than its factorization.

7688625137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198642.

The product of its digits is 3386880, while the sum is 53.

The square root of 7688625137 is about 87684.8056221829. The cubic root of 7688625137 is about 1973.7079740101.

The spelling of 7688625137 in words is "seven billion, six hundred eighty-eight million, six hundred twenty-five thousand, one hundred thirty-seven".