84071909990947 has 12 divisors (see below), whose sum is σ = 87893395163280. Its totient is φ = 80409967843568.

The previous prime is 84071909990941. The next prime is 84071909990963. The reversal of 84071909990947 is 74909990917048.

It is a de Polignac number, because none of the positive numbers 2^k-84071909990947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84071909990941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145948 + ... + 12967849.

It is an arithmetic number, because the mean of its divisors is an integer number (7324449596940).

Almost surely, 2^{84071909990947} is an apocalyptic number.

84071909990947 is a deficient number, since it is larger than the sum of its proper divisors (3821485172333).

84071909990947 is a wasteful number, since it uses less digits than its factorization.

84071909990947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13125962 (or 13125939 counting only the distinct ones).

The product of its (nonzero) digits is 370355328, while the sum is 76.

The spelling of 84071909990947 in words is "eighty-four trillion, seventy-one billion, nine hundred nine million, nine hundred ninety thousand, nine hundred forty-seven".