166531051 has 2 divisors, whose sum is σ = 166531052. Its totient is φ = 166531050.

The previous prime is 166531033. The next prime is 166531087. The reversal of 166531051 is 150135661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166531051 - 2⁵ = 166531019 is a prime.

It is not a weakly prime, because it can be changed into another prime (166531091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265525 + 83265526.

It is an arithmetic number, because the mean of its divisors is an integer number (83265526).

Almost surely, 2^166531051 is an apocalyptic number.

166531051 is a deficient number, since it is larger than the sum of its proper divisors (1).

166531051 is an equidigital number, since it uses as much as digits as its factorization.

166531051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 166531051 is about 12904.6910462824. The cubic root of 166531051 is about 550.1719032906.

The spelling of 166531051 in words is "one hundred sixty-six million, five hundred thirty-one thousand, fifty-one".