84393407485991 has 4 divisors (see below), whose sum is σ = 84599748336000. Its totient is φ = 84187066635984.

The previous prime is 84393407485951. The next prime is 84393407486053. The reversal of 84393407485991 is 19958470439348.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84393407485991 is a prime.

It is a super-2 number, since 2×84393407485991² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84393407485901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103170424391 + ... + 103170425208.

It is an arithmetic number, because the mean of its divisors is an integer number (21149937084000).

Almost surely, 2^{84393407485991} is an apocalyptic number.

84393407485991 is a deficient number, since it is larger than the sum of its proper divisors (206340850009).

84393407485991 is a wasteful number, since it uses less digits than its factorization.

84393407485991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206340850008.

The product of its (nonzero) digits is 940584960, while the sum is 74.

The spelling of 84393407485991 in words is "eighty-four trillion, three hundred ninety-three billion, four hundred seven million, four hundred eighty-five thousand, nine hundred ninety-one".