166420023 has 48 divisors (see below), whose sum is σ = 284653440. Its totient is φ = 85512000.

The previous prime is 166420003. The next prime is 166420073. The reversal of 166420023 is 320024661.

It is not a de Polignac number, because 166420023 - 2⁵ = 166419991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166419975 and 166420002.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 162808 + ... + 163826.

It is an arithmetic number, because the mean of its divisors is an integer number (5930280).

Almost surely, 2^166420023 is an apocalyptic number.

166420023 is a deficient number, since it is larger than the sum of its proper divisors (118233417).

166420023 is a wasteful number, since it uses less digits than its factorization.

166420023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 166420023 is about 12900.3884825225. The cubic root of 166420023 is about 550.0496076467.

Adding to 166420023 its reverse (320024661), we get a palindrome (486444684).

The spelling of 166420023 in words is "one hundred sixty-six million, four hundred twenty thousand, twenty-three".