7904144657 has 2 divisors, whose sum is σ = 7904144658. Its totient is φ = 7904144656.

The previous prime is 7904144639. The next prime is 7904144669. The reversal of 7904144657 is 7564414097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7792652176 + 111492481 = 88276^2 + 10559^2 .

It is a cyclic number.

It is not a de Polignac number, because 7904144657 - 2³² = 3609177361 is a prime.

It is not a weakly prime, because it can be changed into another prime (7904149657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3952072328 + 3952072329.

It is an arithmetic number, because the mean of its divisors is an integer number (3952072329).

Almost surely, 2^7904144657 is an apocalyptic number.

It is an amenable number.

7904144657 is a deficient number, since it is larger than the sum of its proper divisors (1).

7904144657 is an equidigital number, since it uses as much as digits as its factorization.

7904144657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 7904144657 is about 88905.2566331148. The cubic root of 7904144657 is about 1991.9799370335.

The spelling of 7904144657 in words is "seven billion, nine hundred four million, one hundred forty-four thousand, six hundred fifty-seven".