166949129772 has 36 divisors (see below), whose sum is σ = 422090452056. Its totient is φ = 55639140480.

The previous prime is 166949129771. The next prime is 166949129773. The reversal of 166949129772 is 277921949661.

166949129772 is a `hidden beast` number, since 16 + 69 + 491 + 2 + 9 + 7 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (166949129771) and next prime (166949129773).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (166949129771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247054 + ... + 628437.

Almost surely, 2^166949129772 is an apocalyptic number.

166949129772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166949129772 is an abundant number, since it is smaller than the sum of its proper divisors (255141322284).

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

166949129772 is a wasteful number, since it uses less digits than its factorization.

166949129772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880798 (or 880793 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 166949129772 in words is "one hundred sixty-six billion, nine hundred forty-nine million, one hundred twenty-nine thousand, seven hundred seventy-two".