7489888657 has 2 divisors, whose sum is σ = 7489888658. Its totient is φ = 7489888656.

The previous prime is 7489888639. The next prime is 7489888663. The reversal of 7489888657 is 7568889847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7472046481 + 17842176 = 86441^2 + 4224^2 .

It is a cyclic number.

It is not a de Polignac number, because 7489888657 - 2⁷ = 7489888529 is a prime.

It is not a weakly prime, because it can be changed into another prime (7489888607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3744944328 + 3744944329.

It is an arithmetic number, because the mean of its divisors is an integer number (3744944329).

Almost surely, 2^7489888657 is an apocalyptic number.

It is an amenable number.

7489888657 is a deficient number, since it is larger than the sum of its proper divisors (1).

7489888657 is an equidigital number, since it uses as much as digits as its factorization.

7489888657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216760320, while the sum is 70.

The square root of 7489888657 is about 86544.1428231859. The cubic root of 7489888657 is about 1956.5537678759.

The spelling of 7489888657 in words is "seven billion, four hundred eighty-nine million, eight hundred eighty-eight thousand, six hundred fifty-seven".