1998966025 has 36 divisors (see below), whose sum is σ = 2976476160. Its totient is φ = 1326477600.

The previous prime is 1998966019. The next prime is 1998966127. The reversal of 1998966025 is 5206698991.

It is a happy number.

It is not a de Polignac number, because 1998966025 - 2⁹ = 1998965513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11656 + ... + 64294.

Almost surely, 2^1998966025 is an apocalyptic number.

It is an amenable number.

1998966025 is a deficient number, since it is larger than the sum of its proper divisors (977510135).

1998966025 is a wasteful number, since it uses less digits than its factorization.

1998966025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52694 (or 52682 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 55.

The square root of 1998966025 is about 44709.7978635556. The cubic root of 1998966025 is about 1259.7038913232.

The spelling of 1998966025 in words is "one billion, nine hundred ninety-eight million, nine hundred sixty-six thousand, twenty-five".