161015620 has 24 divisors (see below), whose sum is σ = 338751000. Its totient is φ = 64288512.

The previous prime is 161015611. The next prime is 161015629. The reversal of 161015620 is 26510161.

It is an interprime number because it is at equal distance from previous prime (161015611) and next prime (161015629).

It can be written as a sum of positive squares in 4 ways, for example, as 24920064 + 136095556 = 4992^2 + 11666^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161015591 and 161015600.

It is not an unprimeable number, because it can be changed into a prime (161015629) 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, 4306 + ... + 18454.

It is an arithmetic number, because the mean of its divisors is an integer number (14114625).

Almost surely, 2^161015620 is an apocalyptic number.

161015620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161015620 is an abundant number, since it is smaller than the sum of its proper divisors (177735380).

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

161015620 is a wasteful number, since it uses less digits than its factorization.

161015620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14727 (or 14725 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 161015620 is about 12689.1930397484. The cubic root of 161015620 is about 544.0297750788.

Adding to 161015620 its reverse (26510161), we get a palindrome (187525781).

The spelling of 161015620 in words is "one hundred sixty-one million, fifteen thousand, six hundred twenty".