161212661332 has 12 divisors (see below), whose sum is σ = 282124979136. Its totient is φ = 80605524440.

The previous prime is 161212661279. The next prime is 161212661413. The reversal of 161212661332 is 233166212161.

It is a super-2 number, since 2×161212661332² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624693 + ... + 844195.

It is an arithmetic number, because the mean of its divisors is an integer number (23510414928).

Almost surely, 2^161212661332 is an apocalyptic number.

It is an amenable number.

161212661332 is a deficient number, since it is larger than the sum of its proper divisors (120912317804).

161212661332 is a wasteful number, since it uses less digits than its factorization.

161212661332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403118 (or 403116 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

Adding to 161212661332 its reverse (233166212161), we get a palindrome (394378873493).

The spelling of 161212661332 in words is "one hundred sixty-one billion, two hundred twelve million, six hundred sixty-one thousand, three hundred thirty-two".