99018221643 has 24 divisors (see below), whose sum is σ = 156038843376. Its totient is φ = 60007147200.

The previous prime is 99018221639. The next prime is 99018221671. The reversal of 99018221643 is 34612281099.

It is not a de Polignac number, because 99018221643 - 2² = 99018221639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99018221623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2466673 + ... + 2506493.

It is an arithmetic number, because the mean of its divisors is an integer number (6501618474).

Almost surely, 2^99018221643 is an apocalyptic number.

99018221643 is a deficient number, since it is larger than the sum of its proper divisors (57020621733).

99018221643 is a wasteful number, since it uses less digits than its factorization.

99018221643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64955 (or 64952 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 99018221643 in words is "ninety-nine billion, eighteen million, two hundred twenty-one thousand, six hundred forty-three".