161312603100 has 72 divisors (see below), whose sum is σ = 509161244928. Its totient is φ = 39106084800.

The previous prime is 161312603093. The next prime is 161312603117. The reversal of 161312603100 is 1306213161.

It is a super-3 number, since 3×161312603100³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24438004 + ... + 24444603.

Almost surely, 2^161312603100 is an apocalyptic number.

161312603100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161312603100 is an abundant number, since it is smaller than the sum of its proper divisors (347848641828).

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

161312603100 is a wasteful number, since it uses less digits than its factorization.

161312603100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48882635 (or 48882628 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 161312603100 its reverse (1306213161), we get a palindrome (162618816261).

The spelling of 161312603100 in words is "one hundred sixty-one billion, three hundred twelve million, six hundred three thousand, one hundred".