668615241 has 12 divisors (see below), whose sum is σ = 1037036112. Its totient is φ = 382065768.

The previous prime is 668615203. The next prime is 668615243. The reversal of 668615241 is 142516866.

It is a happy number.

It is not a de Polignac number, because 668615241 - 2⁹ = 668614729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668615241.

It is not an unprimeable number, because it can be changed into a prime (668615243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2274055 + ... + 2274348.

It is an arithmetic number, because the mean of its divisors is an integer number (86419676).

Almost surely, 2^668615241 is an apocalyptic number.

It is an amenable number.

668615241 is a deficient number, since it is larger than the sum of its proper divisors (368420871).

668615241 is a wasteful number, since it uses less digits than its factorization.

668615241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548420 (or 4548413 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 668615241 is about 25857.5954218485. The cubic root of 668615241 is about 874.4307550825.

The spelling of 668615241 in words is "six hundred sixty-eight million, six hundred fifteen thousand, two hundred forty-one".