6403988623 has 2 divisors, whose sum is σ = 6403988624. Its totient is φ = 6403988622.

The previous prime is 6403988611. The next prime is 6403988629. The reversal of 6403988623 is 3268893046.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6403988623 - 2¹³ = 6403980431 is a prime.

It is a super-2 number, since 2×6403988623² = 82022140567026872258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6403988629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201994311 + 3201994312.

It is an arithmetic number, because the mean of its divisors is an integer number (3201994312).

Almost surely, 2^6403988623 is an apocalyptic number.

6403988623 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403988623 is an equidigital number, since it uses as much as digits as its factorization.

6403988623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 6403988623 is about 80024.9250108989. The cubic root of 6403988623 is about 1857.0211522637.

The spelling of 6403988623 in words is "six billion, four hundred three million, nine hundred eighty-eight thousand, six hundred twenty-three".