6398798555 has 16 divisors (see below), whose sum is σ = 8138750400. Its totient is φ = 4812874752.

The previous prime is 6398798489. The next prime is 6398798561. The reversal of 6398798555 is 5558978936.

It is a cyclic number.

It is not a de Polignac number, because 6398798555 - 2¹⁸ = 6398536411 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6398798491 and 6398798500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43271 + ... + 121119.

It is an arithmetic number, because the mean of its divisors is an integer number (508671900).

Almost surely, 2^6398798555 is an apocalyptic number.

6398798555 is a deficient number, since it is larger than the sum of its proper divisors (1739951845).

6398798555 is a wasteful number, since it uses less digits than its factorization.

6398798555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78838.

The product of its digits is 81648000, while the sum is 65.

The square root of 6398798555 is about 79992.4906163072. The cubic root of 6398798555 is about 1856.5193467224.

The spelling of 6398798555 in words is "six billion, three hundred ninety-eight million, seven hundred ninety-eight thousand, five hundred fifty-five".