168405355551 has 16 divisors (see below), whose sum is σ = 225720722304. Its totient is φ = 111680951904.

The previous prime is 168405355507. The next prime is 168405355571. The reversal of 168405355551 is 155553504861.

It is not a de Polignac number, because 168405355551 - 2⁷ = 168405355423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168405355551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168405355571) 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 15 ways as a sum of consecutive naturals, for example, 704181 + ... + 912513.

It is an arithmetic number, because the mean of its divisors is an integer number (14107545144).

Almost surely, 2^168405355551 is an apocalyptic number.

168405355551 is a deficient number, since it is larger than the sum of its proper divisors (57315366753).

168405355551 is a wasteful number, since it uses less digits than its factorization.

168405355551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209750.

The product of its (nonzero) digits is 1800000, while the sum is 48.

The spelling of 168405355551 in words is "one hundred sixty-eight billion, four hundred five million, three hundred fifty-five thousand, five hundred fifty-one".