84776977081 has 2 divisors, whose sum is σ = 84776977082. Its totient is φ = 84776977080.

The previous prime is 84776977039. The next prime is 84776977099. The reversal of 84776977081 is 18077967748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82130389056 + 2646588025 = 286584^2 + 51445^2 .

It is a cyclic number.

It is not a de Polignac number, because 84776977081 - 2¹¹ = 84776975033 is a prime.

It is a super-2 number, since 2×84776977081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84776977381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42388488540 + 42388488541.

It is an arithmetic number, because the mean of its divisors is an integer number (42388488541).

Almost surely, 2^84776977081 is an apocalyptic number.

It is an amenable number.

84776977081 is a deficient number, since it is larger than the sum of its proper divisors (1).

84776977081 is an equidigital number, since it uses as much as digits as its factorization.

84776977081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33191424, while the sum is 64.

The spelling of 84776977081 in words is "eighty-four billion, seven hundred seventy-six million, nine hundred seventy-seven thousand, eighty-one".