8416377655991 has 2 divisors, whose sum is σ = 8416377655992. Its totient is φ = 8416377655990.

The previous prime is 8416377655951. The next prime is 8416377655999. The reversal of 8416377655991 is 1995567736148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8416377655991 - 2¹⁰ = 8416377654967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8416377655999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4208188827995 + 4208188827996.

It is an arithmetic number, because the mean of its divisors is an integer number (4208188827996).

Almost surely, 2^{8416377655991} is an apocalyptic number.

8416377655991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8416377655991 is an equidigital number, since it uses as much as digits as its factorization.

8416377655991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 342921600, while the sum is 71.

The spelling of 8416377655991 in words is "eight trillion, four hundred sixteen billion, three hundred seventy-seven million, six hundred fifty-five thousand, nine hundred ninety-one".