1661629196 has 24 divisors (see below), whose sum is σ = 2925511680. Its totient is φ = 825781392.

The previous prime is 1661629187. The next prime is 1661629219. The reversal of 1661629196 is 6919261661.

It is a happy number.

It is a super-3 number, since 3×1661629196³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1661629196.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818735 + ... + 820761.

It is an arithmetic number, because the mean of its divisors is an integer number (121896320).

Almost surely, 2^1661629196 is an apocalyptic number.

It is an amenable number.

1661629196 is a deficient number, since it is larger than the sum of its proper divisors (1263882484).

1661629196 is a wasteful number, since it uses less digits than its factorization.

1661629196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173 (or 3171 counting only the distinct ones).

The product of its digits is 209952, while the sum is 47.

The square root of 1661629196 is about 40763.0861932705. The cubic root of 1661629196 is about 1184.4353796245.

The spelling of 1661629196 in words is "one billion, six hundred sixty-one million, six hundred twenty-nine thousand, one hundred ninety-six".