161675681563 has 8 divisors (see below), whose sum is σ = 176996702016. Its totient is φ = 146458533000.

The previous prime is 161675681537. The next prime is 161675681599. The reversal of 161675681563 is 365186576161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161675681563 - 2¹³ = 161675673371 is a prime.

It is a super-2 number, since 2×161675681563² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161675681513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25964713 + ... + 25970938.

It is an arithmetic number, because the mean of its divisors is an integer number (22124587752).

Almost surely, 2^161675681563 is an apocalyptic number.

161675681563 is a deficient number, since it is larger than the sum of its proper divisors (15321020453).

161675681563 is a wasteful number, since it uses less digits than its factorization.

161675681563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51935945.

The product of its digits is 5443200, while the sum is 55.

The spelling of 161675681563 in words is "one hundred sixty-one billion, six hundred seventy-five million, six hundred eighty-one thousand, five hundred sixty-three".