6688653157 has 2 divisors, whose sum is σ = 6688653158. Its totient is φ = 6688653156.

The previous prime is 6688653131. The next prime is 6688653197. The reversal of 6688653157 is 7513568866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5607164161 + 1081488996 = 74881^2 + 32886^2 .

It is a cyclic number.

It is not a de Polignac number, because 6688653157 - 2⁷ = 6688653029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6688653098 and 6688653107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6688653197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344326578 + 3344326579.

It is an arithmetic number, because the mean of its divisors is an integer number (3344326579).

Almost surely, 2^6688653157 is an apocalyptic number.

It is an amenable number.

6688653157 is a deficient number, since it is larger than the sum of its proper divisors (1).

6688653157 is an equidigital number, since it uses as much as digits as its factorization.

6688653157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7257600, while the sum is 55.

The square root of 6688653157 is about 81784.1864726917. The cubic root of 6688653157 is about 1884.1387953644.

The spelling of 6688653157 in words is "six billion, six hundred eighty-eight million, six hundred fifty-three thousand, one hundred fifty-seven".