161630426 has 8 divisors (see below), whose sum is σ = 242686164. Its totient is φ = 80735040.

The previous prime is 161630363. The next prime is 161630429. The reversal of 161630426 is 624036161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 155875225 + 5755201 = 12485^2 + 2399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161630426² = 52248789217882952, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161630429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37535 + ... + 41618.

Almost surely, 2^161630426 is an apocalyptic number.

161630426 is a deficient number, since it is larger than the sum of its proper divisors (81055738).

161630426 is a wasteful number, since it uses less digits than its factorization.

161630426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80176.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 161630426 is about 12713.3955338454. The cubic root of 161630426 is about 544.7213186793.

Adding to 161630426 its reverse (624036161), we get a palindrome (785666587).

The spelling of 161630426 in words is "one hundred sixty-one million, six hundred thirty thousand, four hundred twenty-six".