84999999999977 has 2 divisors, whose sum is σ = 84999999999978. Its totient is φ = 84999999999976.

The previous prime is 84999999999947. The next prime is 85000000000009. The reversal of 84999999999977 is 77999999999948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74864302637056 + 10135697362921 = 8652416^2 + 3183661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84999999999977 is a prime.

It is not a weakly prime, because it can be changed into another prime (84999999999917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42499999999988 + 42499999999989.

It is an arithmetic number, because the mean of its divisors is an integer number (42499999999989).

Almost surely, 2^{84999999999977} is an apocalyptic number.

It is an amenable number.

84999999999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

84999999999977 is an equidigital number, since it uses as much as digits as its factorization.

84999999999977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5467277940768, while the sum is 116.

The spelling of 84999999999977 in words is "eighty-four trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".