55166159987 has 2 divisors, whose sum is σ = 55166159988. Its totient is φ = 55166159986.

The previous prime is 55166159981. The next prime is 55166160013. The reversal of 55166159987 is 78995166155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55166159987 - 2¹⁰ = 55166158963 is a prime.

It is a super-2 number, since 2×55166159987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55166159981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27583079993 + 27583079994.

It is an arithmetic number, because the mean of its divisors is an integer number (27583079994).

Almost surely, 2^55166159987 is an apocalyptic number.

55166159987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55166159987 is an equidigital number, since it uses as much as digits as its factorization.

55166159987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 62.

The spelling of 55166159987 in words is "fifty-five billion, one hundred sixty-six million, one hundred fifty-nine thousand, nine hundred eighty-seven".