6404557553 has 2 divisors, whose sum is σ = 6404557554. Its totient is φ = 6404557552.

The previous prime is 6404557517. The next prime is 6404557573. The reversal of 6404557553 is 3557554046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4239702769 + 2164854784 = 65113^2 + 46528^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404557553 - 2¹⁸ = 6404295409 is a prime.

It is not a weakly prime, because it can be changed into another prime (6404557573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202278776 + 3202278777.

It is an arithmetic number, because the mean of its divisors is an integer number (3202278777).

Almost surely, 2^6404557553 is an apocalyptic number.

It is an amenable number.

6404557553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404557553 is an equidigital number, since it uses as much as digits as its factorization.

6404557553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260000, while the sum is 44.

The square root of 6404557553 is about 80028.4796369392. The cubic root of 6404557553 is about 1857.0761431879.

The spelling of 6404557553 in words is "six billion, four hundred four million, five hundred fifty-seven thousand, five hundred fifty-three".