166228637 has 8 divisors (see below), whose sum is σ = 171182592. Its totient is φ = 161317600.

The previous prime is 166228633. The next prime is 166228639. The reversal of 166228637 is 736822661.

It is a happy number.

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 166228637 - 2² = 166228633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166228594 and 166228603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166228631) 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, 2783 + ... + 18444.

It is an arithmetic number, because the mean of its divisors is an integer number (21397824).

Almost surely, 2^166228637 is an apocalyptic number.

It is an amenable number.

166228637 is a deficient number, since it is larger than the sum of its proper divisors (4953955).

166228637 is a wasteful number, since it uses less digits than its factorization.

166228637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21459.

The product of its digits is 145152, while the sum is 41.

The square root of 166228637 is about 12892.9685100058. The cubic root of 166228637 is about 549.8386711401.

The spelling of 166228637 in words is "one hundred sixty-six million, two hundred twenty-eight thousand, six hundred thirty-seven".