84637697409 has 12 divisors (see below), whose sum is σ = 122354923236. Its totient is φ = 56378760192.

The previous prime is 84637697399. The next prime is 84637697429. The reversal of 84637697409 is 90479673648.

84637697409 is a `hidden beast` number, since 84 + 63 + 7 + 6 + 97 + 409 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52801146225 + 31836551184 = 229785^2 + 178428^2 .

It is not a de Polignac number, because 84637697409 - 2¹² = 84637693313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84637697429) 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 11 ways as a sum of consecutive naturals, for example, 3852724 + ... + 3874629.

It is an arithmetic number, because the mean of its divisors is an integer number (10196243603).

Almost surely, 2^84637697409 is an apocalyptic number.

It is an amenable number.

84637697409 is a deficient number, since it is larger than the sum of its proper divisors (37717225827).

84637697409 is a wasteful number, since it uses less digits than its factorization.

84637697409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7728576 (or 7728573 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 63.

The spelling of 84637697409 in words is "eighty-four billion, six hundred thirty-seven million, six hundred ninety-seven thousand, four hundred nine".