84718720581 has 16 divisors (see below), whose sum is σ = 123233594880. Its totient is φ = 51342027120.

The previous prime is 84718720577. The next prime is 84718720663. The reversal of 84718720581 is 18502781748.

It is not a de Polignac number, because 84718720581 - 2² = 84718720577 is a prime.

It is a super-2 number, since 2×84718720581² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84718720511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 722256 + ... + 831318.

It is an arithmetic number, because the mean of its divisors is an integer number (7702099680).

Almost surely, 2^84718720581 is an apocalyptic number.

It is an amenable number.

84718720581 is a deficient number, since it is larger than the sum of its proper divisors (38514874299).

84718720581 is a wasteful number, since it uses less digits than its factorization.

84718720581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132616.

The product of its (nonzero) digits is 1003520, while the sum is 51.

It can be divided in two parts, 847187 and 20581, that added together give a palindrome (867768).

The spelling of 84718720581 in words is "eighty-four billion, seven hundred eighteen million, seven hundred twenty thousand, five hundred eighty-one".