168957881990 has 8 divisors (see below), whose sum is σ = 304124187600. Its totient is φ = 67583152792.

The previous prime is 168957881971. The next prime is 168957882001. The reversal of 168957881990 is 99188759861.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8447894090 + ... + 8447894109.

It is an arithmetic number, because the mean of its divisors is an integer number (38015523450).

Almost surely, 2^168957881990 is an apocalyptic number.

168957881990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168957881990 is a deficient number, since it is larger than the sum of its proper divisors (135166305610).

168957881990 is a wasteful number, since it uses less digits than its factorization.

168957881990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16895788206.

The product of its (nonzero) digits is 78382080, while the sum is 71.

The spelling of 168957881990 in words is "one hundred sixty-eight billion, nine hundred fifty-seven million, eight hundred eighty-one thousand, nine hundred ninety".