168378957899 has 4 divisors (see below), whose sum is σ = 168380075136. Its totient is φ = 168377840664.

The previous prime is 168378957883. The next prime is 168378957919. The reversal of 168378957899 is 998759873861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 168378957899 - 2⁴ = 168378957883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168378957839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289259 + ... + 648404.

It is an arithmetic number, because the mean of its divisors is an integer number (42095018784).

Almost surely, 2^168378957899 is an apocalyptic number.

168378957899 is a deficient number, since it is larger than the sum of its proper divisors (1117237).

168378957899 is an equidigital number, since it uses as much as digits as its factorization.

168378957899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117236.

The product of its digits is 1646023680, while the sum is 80.

The spelling of 168378957899 in words is "one hundred sixty-eight billion, three hundred seventy-eight million, nine hundred fifty-seven thousand, eight hundred ninety-nine".