1998357063 has 4 divisors (see below), whose sum is σ = 2664476088. Its totient is φ = 1332238040.

The previous prime is 1998357037. The next prime is 1998357079. The reversal of 1998357063 is 3607538991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998357063 - 2⁹ = 1998356551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1998356997 and 1998357015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998357563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333059508 + ... + 333059513.

It is an arithmetic number, because the mean of its divisors is an integer number (666119022).

Almost surely, 2^1998357063 is an apocalyptic number.

1998357063 is a deficient number, since it is larger than the sum of its proper divisors (666119025).

1998357063 is an equidigital number, since it uses as much as digits as its factorization.

1998357063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666119024.

The product of its (nonzero) digits is 1224720, while the sum is 51.

The square root of 1998357063 is about 44702.9871820665. The cubic root of 1998357063 is about 1259.5759602325.

The spelling of 1998357063 in words is "one billion, nine hundred ninety-eight million, three hundred fifty-seven thousand, sixty-three".