168401953 has 4 divisors (see below), whose sum is σ = 168427908. Its totient is φ = 168376000.

The previous prime is 168401903. The next prime is 168401963. The reversal of 168401953 is 359104861.

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 can be written as a sum of positive squares in 2 ways, for example, as 7441984 + 160959969 = 2728^2 + 12687^2 .

It is a cyclic number.

It is not a de Polignac number, because 168401953 - 2¹⁷ = 168270881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168401903) 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, 6453 + ... + 19453.

It is an arithmetic number, because the mean of its divisors is an integer number (42106977).

Almost surely, 2^168401953 is an apocalyptic number.

It is an amenable number.

168401953 is a deficient number, since it is larger than the sum of its proper divisors (25955).

168401953 is a wasteful number, since it uses less digits than its factorization.

168401953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25954.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 168401953 is about 12976.9778068701. The cubic root of 168401953 is about 552.2245474194.

The spelling of 168401953 in words is "one hundred sixty-eight million, four hundred one thousand, nine hundred fifty-three".