161312511230 has 64 divisors (see below), whose sum is σ = 336159452160. Its totient is φ = 55226116224.

The previous prime is 161312511221. The next prime is 161312511251. The reversal of 161312511230 is 32115213161.

It is a super-2 number, since 2×161312511230² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 161312511230.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 578684 + ... + 810863.

It is an arithmetic number, because the mean of its divisors is an integer number (5252491440).

Almost surely, 2^161312511230 is an apocalyptic number.

161312511230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161312511230 is an abundant number, since it is smaller than the sum of its proper divisors (174846940930).

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

161312511230 is a wasteful number, since it uses less digits than its factorization.

161312511230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389633.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 161312511230 its reverse (32115213161), we get a palindrome (193427724391).

The spelling of 161312511230 in words is "one hundred sixty-one billion, three hundred twelve million, five hundred eleven thousand, two hundred thirty".