84645654591 has 4 divisors (see below), whose sum is σ = 112860872792. Its totient is φ = 56430436392.

The previous prime is 84645654571. The next prime is 84645654623. The reversal of 84645654591 is 19545654648.

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

It is not a de Polignac number, because 84645654591 - 2²⁹ = 84108783679 is a prime.

It is a super-2 number, since 2×84645654591² (a number of 23 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 (84645654571) 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 3 ways as a sum of consecutive naturals, for example, 14107609096 + ... + 14107609101.

It is an arithmetic number, because the mean of its divisors is an integer number (28215218198).

Almost surely, 2^84645654591 is an apocalyptic number.

84645654591 is a deficient number, since it is larger than the sum of its proper divisors (28215218201).

84645654591 is a wasteful number, since it uses less digits than its factorization.

84645654591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28215218200.

The product of its digits is 20736000, while the sum is 57.

Adding to 84645654591 its sum of digits (57), we get a palindrome (84645654648).

The spelling of 84645654591 in words is "eighty-four billion, six hundred forty-five million, six hundred fifty-four thousand, five hundred ninety-one".