166558742 has 16 divisors (see below), whose sum is σ = 291357600. Its totient is φ = 71382024.

The previous prime is 166558739. The next prime is 166558789. The reversal of 166558742 is 247855661.

It is a junction number, because it is equal to n+sod(n) for n = 166558693 and 166558702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120713 + ... + 122084.

It is an arithmetic number, because the mean of its divisors is an integer number (18209850).

Almost surely, 2^166558742 is an apocalyptic number.

166558742 is a deficient number, since it is larger than the sum of its proper divisors (124798858).

166558742 is an equidigital number, since it uses as much as digits as its factorization.

166558742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242820 (or 242806 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 166558742 is about 12905.7639061003. The cubic root of 166558742 is about 550.2023960340.

The spelling of 166558742 in words is "one hundred sixty-six million, five hundred fifty-eight thousand, seven hundred forty-two".