161651410 has 16 divisors (see below), whose sum is σ = 291122712. Its totient is φ = 64627200.

The previous prime is 161651387. The next prime is 161651417. The reversal of 161651410 is 14156161.

It can be written as a sum of positive squares in 4 ways, for example, as 138697729 + 22953681 = 11777^2 + 4791^2 .

It is a super-2 number, since 2×161651410² = 52262356709976200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161651417) by changing a digit.

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, 27970 + ... + 33250.

Almost surely, 2^161651410 is an apocalyptic number.

161651410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161651410 is a deficient number, since it is larger than the sum of its proper divisors (129471302).

161651410 is a wasteful number, since it uses less digits than its factorization.

161651410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8349.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 161651410 is about 12714.2207783253. The cubic root of 161651410 is about 544.7448908450.

The spelling of 161651410 in words is "one hundred sixty-one million, six hundred fifty-one thousand, four hundred ten".