84721566172 has 6 divisors (see below), whose sum is σ = 148262740808. Its totient is φ = 42360783084.

The previous prime is 84721566133. The next prime is 84721566173. The reversal of 84721566172 is 27166512748.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84721566173) 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 as a sum of consecutive naturals, namely, 10590195768 + ... + 10590195775.

Almost surely, 2^84721566172 is an apocalyptic number.

It is an amenable number.

84721566172 is a deficient number, since it is larger than the sum of its proper divisors (63541174636).

84721566172 is a wasteful number, since it uses less digits than its factorization.

84721566172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21180391547 (or 21180391545 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The spelling of 84721566172 in words is "eighty-four billion, seven hundred twenty-one million, five hundred sixty-six thousand, one hundred seventy-two".