161626401 has 8 divisors (see below), whose sum is σ = 239446560. Its totient is φ = 107750916.

The previous prime is 161626363. The next prime is 161626411. The reversal of 161626401 is 104626161.

161626401 is a `hidden beast` number, since 1 + 6 + 16 + 2 + 640 + 1 = 666.

It is not a de Polignac number, because 161626401 - 2⁹ = 161625889 is a prime.

It is a super-2 number, since 2×161626401² = 52246187000425602, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5986163 = 161626401 / (1 + 6 + 1 + 6 + 2 + 6 + 4 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161626411) 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 7 ways as a sum of consecutive naturals, for example, 2993055 + ... + 2993108.

It is an arithmetic number, because the mean of its divisors is an integer number (29930820).

Almost surely, 2^161626401 is an apocalyptic number.

It is an amenable number.

161626401 is a deficient number, since it is larger than the sum of its proper divisors (77820159).

161626401 is an equidigital number, since it uses as much as digits as its factorization.

161626401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5986172 (or 5986166 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161626401 is about 12713.2372352599. The cubic root of 161626401 is about 544.7167970028.

The spelling of 161626401 in words is "one hundred sixty-one million, six hundred twenty-six thousand, four hundred one".