9901799842 has 16 divisors (see below), whose sum is σ = 16385004000. Its totient is φ = 4450246240.

The previous prime is 9901799839. The next prime is 9901799879. The reversal of 9901799842 is 2489971099.

It is a super-2 number, since 2×9901799842² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526592 + ... + 2530507.

It is an arithmetic number, because the mean of its divisors is an integer number (1024062750).

Almost surely, 2^9901799842 is an apocalyptic number.

9901799842 is a deficient number, since it is larger than the sum of its proper divisors (6483204158).

9901799842 is a wasteful number, since it uses less digits than its factorization.

9901799842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5057201.

The product of its (nonzero) digits is 2939328, while the sum is 58.

The square root of 9901799842 is about 99507.7878459772. The cubic root of 9901799842 is about 2147.3592848123.

The spelling of 9901799842 in words is "nine billion, nine hundred one million, seven hundred ninety-nine thousand, eight hundred forty-two".