166227635382521 has 16 divisors (see below), whose sum is σ = 167658525410880. Its totient is φ = 164800260434880.

The previous prime is 166227635382503. The next prime is 166227635382527. The reversal of 166227635382521 is 125283536722661.

It is a cyclic number.

It is not a de Polignac number, because 166227635382521 - 2²² = 166227631188217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166227635382527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291911486 + ... + 292480376.

It is an arithmetic number, because the mean of its divisors is an integer number (10478657838180).

Almost surely, 2^{166227635382521} is an apocalyptic number.

It is an amenable number.

166227635382521 is a deficient number, since it is larger than the sum of its proper divisors (1430890028359).

166227635382521 is a wasteful number, since it uses less digits than its factorization.

166227635382521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571976.

The product of its digits is 43545600, while the sum is 59.

The spelling of 166227635382521 in words is "one hundred sixty-six trillion, two hundred twenty-seven billion, six hundred thirty-five million, three hundred eighty-two thousand, five hundred twenty-one".