168020551 has 4 divisors (see below), whose sum is σ = 168048400. Its totient is φ = 167992704.

The previous prime is 168020533. The next prime is 168020581. The reversal of 168020551 is 155020861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168020551 - 2⁷ = 168020423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168020521) 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, 666 + ... + 18343.

It is an arithmetic number, because the mean of its divisors is an integer number (42012100).

Almost surely, 2^168020551 is an apocalyptic number.

168020551 is a deficient number, since it is larger than the sum of its proper divisors (27849).

168020551 is an equidigital number, since it uses as much as digits as its factorization.

168020551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27848.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 168020551 is about 12962.2741446090. The cubic root of 168020551 is about 551.8073338234.

The spelling of 168020551 in words is "one hundred sixty-eight million, twenty thousand, five hundred fifty-one".