27783807979 has 2 divisors, whose sum is σ = 27783807980. Its totient is φ = 27783807978.

The previous prime is 27783807959. The next prime is 27783808021. The reversal of 27783807979 is 97970838772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27783807979 - 2⁷ = 27783807851 is a prime.

It is not a weakly prime, because it can be changed into another prime (27783807949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13891903989 + 13891903990.

It is an arithmetic number, because the mean of its divisors is an integer number (13891903990).

Almost surely, 2^27783807979 is an apocalyptic number.

27783807979 is a deficient number, since it is larger than the sum of its proper divisors (1).

27783807979 is an equidigital number, since it uses as much as digits as its factorization.

27783807979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74680704, while the sum is 67.

The spelling of 27783807979 in words is "twenty-seven billion, seven hundred eighty-three million, eight hundred seven thousand, nine hundred seventy-nine".