668455553 has 4 divisors (see below), whose sum is σ = 669355968. Its totient is φ = 667555140.

The previous prime is 668455537. The next prime is 668455559. The reversal of 668455553 is 355554866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668455553 - 2⁴ = 668455537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668455498 and 668455507.

It is not an unprimeable number, because it can be changed into a prime (668455559) 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, 449093 + ... + 450578.

It is an arithmetic number, because the mean of its divisors is an integer number (167338992).

Almost surely, 2^668455553 is an apocalyptic number.

It is an amenable number.

668455553 is a deficient number, since it is larger than the sum of its proper divisors (900415).

668455553 is an equidigital number, since it uses as much as digits as its factorization.

668455553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900414.

The product of its digits is 2160000, while the sum is 47.

The square root of 668455553 is about 25854.5074019986. The cubic root of 668455553 is about 874.3611349642.

The spelling of 668455553 in words is "six hundred sixty-eight million, four hundred fifty-five thousand, five hundred fifty-three".