166021434 has 16 divisors (see below), whose sum is σ = 368936640. Its totient is φ = 55340460.

The previous prime is 166021403. The next prime is 166021463. The reversal of 166021434 is 434120661.

166021434 is a `hidden beast` number, since 16 + 602 + 1 + 43 + 4 = 666.

166021434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 166021398 and 166021407.

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, 1537182 + ... + 1537289.

It is an arithmetic number, because the mean of its divisors is an integer number (23058540).

Almost surely, 2^166021434 is an apocalyptic number.

166021434 is an abundant number, since it is smaller than the sum of its proper divisors (202915206).

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

166021434 is a wasteful number, since it uses less digits than its factorization.

166021434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3074482 (or 3074476 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 166021434 is about 12884.9305003946. The cubic root of 166021434 is about 549.6101192813.

The spelling of 166021434 in words is "one hundred sixty-six million, twenty-one thousand, four hundred thirty-four".