166420002 has 64 divisors (see below), whose sum is σ = 389836800. Its totient is φ = 46381440.

The previous prime is 166419991. The next prime is 166420003. The reversal of 166420002 is 200024661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (166420003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 592102 + ... + 592382.

It is an arithmetic number, because the mean of its divisors is an integer number (6091200).

Almost surely, 2^166420002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166420002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194918400).

166420002 is an abundant number, since it is smaller than the sum of its proper divisors (223416798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166420002 is a wasteful number, since it uses less digits than its factorization.

166420002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 166420002 is about 12900.3876685935. The cubic root of 166420002 is about 550.0495845104.

Adding to 166420002 its reverse (200024661), we get a palindrome (366444663).

The spelling of 166420002 in words is "one hundred sixty-six million, four hundred twenty thousand, two".