99947673621 has 12 divisors (see below), whose sum is σ = 150645769248. Its totient is φ = 63734748264.

The previous prime is 99947673611. The next prime is 99947673647. The reversal of 99947673621 is 12637674999.

99947673621 is a `hidden beast` number, since 9 + 99 + 476 + 73 + 6 + 2 + 1 = 666.

It is not a de Polignac number, because 99947673621 - 2¹⁵ = 99947640853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99947673601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241419295 + ... + 241419708.

It is an arithmetic number, because the mean of its divisors is an integer number (12553814104).

Almost surely, 2^99947673621 is an apocalyptic number.

It is an amenable number.

99947673621 is a deficient number, since it is larger than the sum of its proper divisors (50698095627).

99947673621 is a wasteful number, since it uses less digits than its factorization.

99947673621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482839032 (or 482839029 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 63.

The spelling of 99947673621 in words is "ninety-nine billion, nine hundred forty-seven million, six hundred seventy-three thousand, six hundred twenty-one".