161563302621 has 32 divisors (see below), whose sum is σ = 273611367680. Its totient is φ = 92299938048.

The previous prime is 161563302617. The next prime is 161563302751. The reversal of 161563302621 is 126203365161.

161563302621 is a `hidden beast` number, since 1 + 6 + 1 + 563 + 30 + 2 + 62 + 1 = 666.

It is not a de Polignac number, because 161563302621 - 2² = 161563302617 is a prime.

It is a super-3 number, since 3×161563302621³ (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 not an unprimeable number, because it can be changed into a prime (161563302221) by changing a digit.

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, 712665 + ... + 911601.

It is an arithmetic number, because the mean of its divisors is an integer number (8550355240).

Almost surely, 2^161563302621 is an apocalyptic number.

It is an amenable number.

161563302621 is a deficient number, since it is larger than the sum of its proper divisors (112048065059).

161563302621 is a wasteful number, since it uses less digits than its factorization.

161563302621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203250 (or 203244 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 161563302621 its reverse (126203365161), we get a palindrome (287766667782).

The spelling of 161563302621 in words is "one hundred sixty-one billion, five hundred sixty-three million, three hundred two thousand, six hundred twenty-one".