168550985491 has 32 divisors (see below), whose sum is σ = 201879014400. Its totient is φ = 137591308800.

The previous prime is 168550985489. The next prime is 168550985497. The reversal of 168550985491 is 194589055861.

It is a cyclic number.

It is not a de Polignac number, because 168550985491 - 2¹ = 168550985489 is a prime.

It is a super-2 number, since 2×168550985491² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168550985497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39573120 + ... + 39577378.

It is an arithmetic number, because the mean of its divisors is an integer number (6308719200).

Almost surely, 2^168550985491 is an apocalyptic number.

168550985491 is a deficient number, since it is larger than the sum of its proper divisors (33328028909).

168550985491 is a wasteful number, since it uses less digits than its factorization.

168550985491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5299.

The product of its (nonzero) digits is 15552000, while the sum is 61.

The spelling of 168550985491 in words is "one hundred sixty-eight billion, five hundred fifty million, nine hundred eighty-five thousand, four hundred ninety-one".