161640026 has 16 divisors (see below), whose sum is σ = 251751240. Its totient is φ = 77743680.

The previous prime is 161640023. The next prime is 161640041. The reversal of 161640026 is 620046161.

It is a happy number.

161640026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 121330225 + 40309801 = 11015^2 + 6349^2 .

It is a super-2 number, since 2×161640026² = 52254996010561352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161639977 and 161640004.

It is not an unprimeable number, because it can be changed into a prime (161640023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11036 + ... + 21096.

Almost surely, 2^161640026 is an apocalyptic number.

161640026 is a deficient number, since it is larger than the sum of its proper divisors (90111214).

161640026 is a wasteful number, since it uses less digits than its factorization.

161640026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10369.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 161640026 is about 12713.7730827634. The cubic root of 161640026 is about 544.7321029961.

Adding to 161640026 its reverse (620046161), we get a palindrome (781686187).

The spelling of 161640026 in words is "one hundred sixty-one million, six hundred forty thousand, twenty-six".