1998163825 has 12 divisors (see below), whose sum is σ = 2831683840. Its totient is φ = 1370169360.

The previous prime is 1998163813. The next prime is 1998163837. The reversal of 1998163825 is 5283618991.

It is an interprime number because it is at equal distance from previous prime (1998163813) and next prime (1998163837).

It is not a de Polignac number, because 1998163825 - 2²⁵ = 1964609393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5708865 + ... + 5709214.

Almost surely, 2^1998163825 is an apocalyptic number.

It is an amenable number.

1998163825 is a deficient number, since it is larger than the sum of its proper divisors (833520015).

1998163825 is a wasteful number, since it uses less digits than its factorization.

1998163825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11418096 (or 11418091 counting only the distinct ones).

The product of its digits is 933120, while the sum is 52.

The square root of 1998163825 is about 44700.8257753702. The cubic root of 1998163825 is about 1259.5353592492.

The spelling of 1998163825 in words is "one billion, nine hundred ninety-eight million, one hundred sixty-three thousand, eight hundred twenty-five".