168351851837 has 16 divisors (see below), whose sum is σ = 181559217840. Its totient is φ = 155181422592.

The previous prime is 168351851831. The next prime is 168351851879. The reversal of 168351851837 is 738158153861.

It can be written as a sum of positive squares in 8 ways, for example, as 1582527961 + 166769323876 = 39781^2 + 408374^2 .

It is a cyclic number.

It is not a de Polignac number, because 168351851837 - 2¹⁴ = 168351835453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168351851831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37467563 + ... + 37472055.

It is an arithmetic number, because the mean of its divisors is an integer number (11347451115).

Almost surely, 2^168351851837 is an apocalyptic number.

It is an amenable number.

168351851837 is a deficient number, since it is larger than the sum of its proper divisors (13207366003).

168351851837 is a wasteful number, since it uses less digits than its factorization.

168351851837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7952.

The product of its digits is 4838400, while the sum is 56.

The spelling of 168351851837 in words is "one hundred sixty-eight billion, three hundred fifty-one million, eight hundred fifty-one thousand, eight hundred thirty-seven".