161669776 has 20 divisors (see below), whose sum is σ = 313432444. Its totient is φ = 80784000.

The previous prime is 161669771. The next prime is 161669797. The reversal of 161669776 is 677966161.

It can be written as a sum of positive squares in 2 ways, for example, as 101203600 + 60466176 = 10060^2 + 7776^2 .

It is a super-2 number, since 2×161669776² = 52274232943780352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161669771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47326 + ... + 50626.

Almost surely, 2^161669776 is an apocalyptic number.

161669776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161669776 is a deficient number, since it is larger than the sum of its proper divisors (151762668).

161669776 is a wasteful number, since it uses less digits than its factorization.

161669776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6370 (or 6364 counting only the distinct ones).

The product of its digits is 571536, while the sum is 49.

The square root of 161669776 is about 12714.9430199274. The cubic root of 161669776 is about 544.7655204326.

The spelling of 161669776 in words is "one hundred sixty-one million, six hundred sixty-nine thousand, seven hundred seventy-six".