668225739 has 16 divisors (see below), whose sum is σ = 959698944. Its totient is φ = 412368000.

The previous prime is 668225731. The next prime is 668225741. The reversal of 668225739 is 937522866.

668225739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668225739 - 2³ = 668225731 is a prime.

It is a super-2 number, since 2×668225739² = 893051276524192242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668225731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154062 + ... + 158339.

It is an arithmetic number, because the mean of its divisors is an integer number (59981184).

Almost surely, 2^668225739 is an apocalyptic number.

668225739 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

668225739 is a deficient number, since it is larger than the sum of its proper divisors (291473205).

668225739 is a wasteful number, since it uses less digits than its factorization.

668225739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312458.

The product of its digits is 1088640, while the sum is 48.

The square root of 668225739 is about 25850.0626498274. The cubic root of 668225739 is about 874.2609221372.

The spelling of 668225739 in words is "six hundred sixty-eight million, two hundred twenty-five thousand, seven hundred thirty-nine".