84001720671 has 24 divisors (see below), whose sum is σ = 132382705104. Its totient is φ = 50903842560.

The previous prime is 84001720669. The next prime is 84001720723. The reversal of 84001720671 is 17602710048.

It is not a de Polignac number, because 84001720671 - 2¹ = 84001720669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84001720571) 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, 826855 + ... + 922871.

It is an arithmetic number, because the mean of its divisors is an integer number (5515946046).

Almost surely, 2^84001720671 is an apocalyptic number.

84001720671 is a deficient number, since it is larger than the sum of its proper divisors (48380984433).

84001720671 is a wasteful number, since it uses less digits than its factorization.

84001720671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104871 (or 104868 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The spelling of 84001720671 in words is "eighty-four billion, one million, seven hundred twenty thousand, six hundred seventy-one".