166632138436 has 27 divisors (see below), whose sum is σ = 297289256173. Its totient is φ = 81722841200.

The previous prime is 166632138419. The next prime is 166632138451. The reversal of 166632138436 is 634831236661.

The square root of 166632138436 is 408206.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 120124628100 + 46507510336 = 346590^2 + 215656^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166632138436.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43267911 + ... + 43271761.

Almost surely, 2^166632138436 is an apocalyptic number.

166632138436 is the 408206-th square number.

It is an amenable number.

166632138436 is a deficient number, since it is larger than the sum of its proper divisors (130657117737).

166632138436 is an frugal number, since it uses more digits than its factorization.

166632138436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812 (or 3906 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 49.

Multiplying 166632138436 by its sum of digits (49), we get a square (8164974783364 = 2857442²).

The spelling of 166632138436 in words is "one hundred sixty-six billion, six hundred thirty-two million, one hundred thirty-eight thousand, four hundred thirty-six".