166663051 has 2 divisors, whose sum is σ = 166663052. Its totient is φ = 166663050.

The previous prime is 166663043. The next prime is 166663069. The reversal of 166663051 is 150366661.

It is a weak prime.

It is an emirp because it is prime and its reverse (150366661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166663051 - 2³ = 166663043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166662998 and 166663016.

It is not a weakly prime, because it can be changed into another prime (166663351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83331525 + 83331526.

It is an arithmetic number, because the mean of its divisors is an integer number (83331526).

Almost surely, 2^166663051 is an apocalyptic number.

166663051 is a deficient number, since it is larger than the sum of its proper divisors (1).

166663051 is an equidigital number, since it uses as much as digits as its factorization.

166663051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166663051 is about 12909.8044524307. The cubic root of 166663051 is about 550.3172285642.

It can be divided in two parts, 1666630 and 51, that added together give a square (1666681 = 1291²).

The spelling of 166663051 in words is "one hundred sixty-six million, six hundred sixty-three thousand, fifty-one".