161635219216 has 10 divisors (see below), whose sum is σ = 313168237262. Its totient is φ = 80817609600.

The previous prime is 161635219211. The next prime is 161635219259. The reversal of 161635219216 is 612912536161.

It can be written as a sum of positive squares in only one way, i.e., 136828969216 + 24806250000 = 369904^2 + 157500^2 .

It is a super-2 number, since 2×161635219216² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161635219211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5051100585 + ... + 5051100616.

Almost surely, 2^161635219216 is an apocalyptic number.

161635219216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161635219216 is a deficient number, since it is larger than the sum of its proper divisors (151533018046).

161635219216 is a wasteful number, since it uses less digits than its factorization.

161635219216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10102201209 (or 10102201203 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The spelling of 161635219216 in words is "one hundred sixty-one billion, six hundred thirty-five million, two hundred nineteen thousand, two hundred sixteen".