9998909658 has 24 divisors (see below), whose sum is σ = 21668224500. Its totient is φ = 3332366784.

The previous prime is 9998909629. The next prime is 9998909659. The reversal of 9998909658 is 8569098999.

It can be written as a sum of positive squares in 2 ways, for example, as 9913587489 + 85322169 = 99567^2 + 9237^2 .

It is not an unprimeable number, because it can be changed into a prime (9998909659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58318 + ... + 152966.

Almost surely, 2^9998909658 is an apocalyptic number.

9998909658 is an abundant number, since it is smaller than the sum of its proper divisors (11669314842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9998909658 is a wasteful number, since it uses less digits than its factorization.

9998909658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100526 (or 100523 counting only the distinct ones).

The product of its (nonzero) digits is 113374080, while the sum is 72.

The square root of 9998909658 is about 99994.5481413862. The cubic root of 9998909658 is about 2154.3563848315.

The spelling of 9998909658 in words is "nine billion, nine hundred ninety-eight million, nine hundred nine thousand, six hundred fifty-eight".