84639484771 has 4 divisors (see below), whose sum is σ = 84640516792. Its totient is φ = 84638452752.

The previous prime is 84639484753. The next prime is 84639484799. The reversal of 84639484771 is 17748493648.

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

It is a cyclic number.

It is not a de Polignac number, because 84639484771 - 2¹⁷ = 84639353699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84639484751) 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, 381261 + ... + 560926.

It is an arithmetic number, because the mean of its divisors is an integer number (21160129198).

Almost surely, 2^84639484771 is an apocalyptic number.

84639484771 is a deficient number, since it is larger than the sum of its proper divisors (1032021).

84639484771 is an equidigital number, since it uses as much as digits as its factorization.

84639484771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032020.

The product of its digits is 32514048, while the sum is 61.

The spelling of 84639484771 in words is "eighty-four billion, six hundred thirty-nine million, four hundred eighty-four thousand, seven hundred seventy-one".