668567018354 has 4 divisors (see below), whose sum is σ = 1002850527534. Its totient is φ = 334283509176.

The previous prime is 668567018351. The next prime is 668567018377. The reversal of 668567018354 is 453810765866.

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

It can be written as a sum of positive squares in only one way, i.e., 385088508025 + 283478510329 = 620555^2 + 532427^2 .

It is a junction number, because it is equal to n+sod(n) for n = 668567018293 and 668567018302.

It is not an unprimeable number, because it can be changed into a prime (668567018351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167141754587 + ... + 167141754590.

Almost surely, 2^668567018354 is an apocalyptic number.

668567018354 is a deficient number, since it is larger than the sum of its proper divisors (334283509180).

668567018354 is a wasteful number, since it uses less digits than its factorization.

668567018354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334283509179.

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 668567018354 in words is "six hundred sixty-eight billion, five hundred sixty-seven million, eighteen thousand, three hundred fifty-four".