166528825661 has 8 divisors (see below), whose sum is σ = 181673139648. Its totient is φ = 151385400000.

The previous prime is 166528825657. The next prime is 166528825663.

166528825661 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166528825661 - 2² = 166528825657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166528825597 and 166528825606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166528825663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205736 + ... + 612686.

It is an arithmetic number, because the mean of its divisors is an integer number (22709142456).

Almost surely, 2^166528825661 is an apocalyptic number.

166528825661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166528825661 is a deficient number, since it is larger than the sum of its proper divisors (15144313987).

166528825661 is a wasteful number, since it uses less digits than its factorization.

166528825661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444163.

The product of its digits is 8294400, while the sum is 56.

The spelling of 166528825661 in words is "one hundred sixty-six billion, five hundred twenty-eight million, eight hundred twenty-five thousand, six hundred sixty-one".