84667937561 has 4 divisors (see below), whose sum is σ = 85106631732. Its totient is φ = 84229243392.

The previous prime is 84667937491. The next prime is 84667937581. The reversal of 84667937561 is 16573976648.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56939027161 + 27728910400 = 238619^2 + 166520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84667937561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84667937494 and 84667937503.

It is not an unprimeable number, because it can be changed into a prime (84667937581) 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, 219346796 + ... + 219347181.

It is an arithmetic number, because the mean of its divisors is an integer number (21276657933).

Almost surely, 2^84667937561 is an apocalyptic number.

It is an amenable number.

84667937561 is a deficient number, since it is larger than the sum of its proper divisors (438694171).

84667937561 is a wasteful number, since it uses less digits than its factorization.

84667937561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438694170.

The product of its digits is 45722880, while the sum is 62.

The spelling of 84667937561 in words is "eighty-four billion, six hundred sixty-seven million, nine hundred thirty-seven thousand, five hundred sixty-one".