161556332810 has 32 divisors (see below), whose sum is σ = 292938066000. Its totient is φ = 64148267520.

The previous prime is 161556332807. The next prime is 161556332813. The reversal of 161556332810 is 18233655161.

It is an interprime number because it is at equal distance from previous prime (161556332807) and next prime (161556332813).

It can be written as a sum of positive squares in 8 ways, for example, as 51512203369 + 110044129441 = 226963^2 + 331729^2 .

It is a super-2 number, since 2×161556332810² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161556332813) 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 15 ways as a sum of consecutive naturals, for example, 2381846 + ... + 2448734.

Almost surely, 2^161556332810 is an apocalyptic number.

161556332810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161556332810 is a deficient number, since it is larger than the sum of its proper divisors (131381733190).

161556332810 is a wasteful number, since it uses less digits than its factorization.

161556332810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68666.

The product of its (nonzero) digits is 129600, while the sum is 41.

Adding to 161556332810 its reverse (18233655161), we get a palindrome (179789987971).

The spelling of 161556332810 in words is "one hundred sixty-one billion, five hundred fifty-six million, three hundred thirty-two thousand, eight hundred ten".