166530176162021 has 16 divisors (see below), whose sum is σ = 210277051087104. Its totient is φ = 128502642326784.

The previous prime is 166530176162017. The next prime is 166530176162023. The reversal of 166530176162021 is 120261671035661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166530176162021 - 2² = 166530176162017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166530176162023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30422024330 + ... + 30422029803.

It is an arithmetic number, because the mean of its divisors is an integer number (13142315692944).

Almost surely, 2^{166530176162021} is an apocalyptic number.

It is an amenable number.

166530176162021 is a deficient number, since it is larger than the sum of its proper divisors (43746874925083).

166530176162021 is a wasteful number, since it uses less digits than its factorization.

166530176162021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60844054180.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 166530176162021 in words is "one hundred sixty-six trillion, five hundred thirty billion, one hundred seventy-six million, one hundred sixty-two thousand, twenty-one".