398933655553 has 4 divisors (see below), whose sum is σ = 419930163760. Its totient is φ = 377937147348.

The previous prime is 398933655511. The next prime is 398933655563. The reversal of 398933655553 is 355556339893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398933655553 - 2¹³ = 398933647361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398933655563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10498254075 + ... + 10498254112.

It is an arithmetic number, because the mean of its divisors is an integer number (104982540940).

Almost surely, 2^398933655553 is an apocalyptic number.

It is an amenable number.

398933655553 is a deficient number, since it is larger than the sum of its proper divisors (20996508207).

398933655553 is a wasteful number, since it uses less digits than its factorization.

398933655553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20996508206.

The product of its digits is 196830000, while the sum is 64.

The spelling of 398933655553 in words is "three hundred ninety-eight billion, nine hundred thirty-three million, six hundred fifty-five thousand, five hundred fifty-three".