168400738998 has 24 divisors (see below), whose sum is σ = 367317054000. Its totient is φ = 55756843344.

The previous prime is 168400738997. The next prime is 168400738999. The reversal of 168400738998 is 899837004861.

168400738998 is a `hidden beast` number, since 1 + 68 + 400 + 7 + 3 + 89 + 98 = 666.

It is an interprime number because it is at equal distance from previous prime (168400738997) and next prime (168400738999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168400738997) 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 11 ways as a sum of consecutive naturals, for example, 31391938 + ... + 31397301.

It is an arithmetic number, because the mean of its divisors is an integer number (15304877250).

Almost surely, 2^168400738998 is an apocalyptic number.

168400738998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

168400738998 is an abundant number, since it is smaller than the sum of its proper divisors (198916315002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168400738998 is a wasteful number, since it uses less digits than its factorization.

168400738998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62789396 (or 62789393 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 63.

The spelling of 168400738998 in words is "one hundred sixty-eight billion, four hundred million, seven hundred thirty-eight thousand, nine hundred ninety-eight".