5166779987 has 2 divisors, whose sum is σ = 5166779988. Its totient is φ = 5166779986.

The previous prime is 5166779957. The next prime is 5166780049. The reversal of 5166779987 is 7899776615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5166779987 - 2¹⁴ = 5166763603 is a prime.

It is not a weakly prime, because it can be changed into another prime (5166779957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583389993 + 2583389994.

It is an arithmetic number, because the mean of its divisors is an integer number (2583389994).

Almost surely, 2^5166779987 is an apocalyptic number.

5166779987 is a deficient number, since it is larger than the sum of its proper divisors (1).

5166779987 is an equidigital number, since it uses as much as digits as its factorization.

5166779987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40007520, while the sum is 65.

The square root of 5166779987 is about 71880.3171041976. The cubic root of 5166779987 is about 1728.7810347950.

The spelling of 5166779987 in words is "five billion, one hundred sixty-six million, seven hundred seventy-nine thousand, nine hundred eighty-seven".