668383654 has 4 divisors (see below), whose sum is σ = 1002575484. Its totient is φ = 334191826.

The previous prime is 668383627. The next prime is 668383717. The reversal of 668383654 is 456383866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 456383866 = 2 ⋅228191933.

It is a junction number, because it is equal to n+sod(n) for n = 668383598 and 668383607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167095912 + ... + 167095915.

It is an arithmetic number, because the mean of its divisors is an integer number (250643871).

Almost surely, 2^668383654 is an apocalyptic number.

668383654 is a deficient number, since it is larger than the sum of its proper divisors (334191830).

668383654 is a wasteful number, since it uses less digits than its factorization.

668383654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334191829.

The product of its digits is 2488320, while the sum is 49.

The square root of 668383654 is about 25853.1169107324. The cubic root of 668383654 is about 874.3297851135.

The spelling of 668383654 in words is "six hundred sixty-eight million, three hundred eighty-three thousand, six hundred fifty-four".