7725499657 has 2 divisors, whose sum is σ = 7725499658. Its totient is φ = 7725499656.

The previous prime is 7725499643. The next prime is 7725499673. The reversal of 7725499657 is 7569945277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6136998921 + 1588500736 = 78339^2 + 39856^2 .

It is a cyclic number.

It is not a de Polignac number, because 7725499657 - 2²³ = 7717111049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7725499595 and 7725499604.

It is not a weakly prime, because it can be changed into another prime (7725499697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862749828 + 3862749829.

It is an arithmetic number, because the mean of its divisors is an integer number (3862749829).

Almost surely, 2^7725499657 is an apocalyptic number.

It is an amenable number.

7725499657 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725499657 is an equidigital number, since it uses as much as digits as its factorization.

7725499657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33339600, while the sum is 61.

The square root of 7725499657 is about 87894.8215596346. The cubic root of 7725499657 is about 1976.8582335198.

The spelling of 7725499657 in words is "seven billion, seven hundred twenty-five million, four hundred ninety-nine thousand, six hundred fifty-seven".