161623530 has 48 divisors (see below), whose sum is σ = 438497280. Its totient is φ = 41225184.

The previous prime is 161623529. The next prime is 161623531. The reversal of 161623530 is 35326161.

161623530 is a `hidden beast` number, since 1 + 6 + 1 + 623 + 5 + 30 = 666.

161623530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161623529) and next prime (161623531).

It is a super-2 number, since 2×161623530² = 52244330899321800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161623494 and 161623503.

It is not an unprimeable number, because it can be changed into a prime (161623531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36970 + ... + 41109.

It is an arithmetic number, because the mean of its divisors is an integer number (9135360).

Almost surely, 2^161623530 is an apocalyptic number.

161623530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161623530 is an abundant number, since it is smaller than the sum of its proper divisors (276873750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161623530 is a wasteful number, since it uses less digits than its factorization.

161623530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78115 (or 78112 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 161623530 is about 12713.1243209527. The cubic root of 161623530 is about 544.7135716816.

Adding to 161623530 its reverse (35326161), we get a palindrome (196949691).

The spelling of 161623530 in words is "one hundred sixty-one million, six hundred twenty-three thousand, five hundred thirty".