668261513 has 8 divisors (see below), whose sum is σ = 691389696. Its totient is φ = 645231600.

The previous prime is 668261509. The next prime is 668261537. The reversal of 668261513 is 315162866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668261513 - 2² = 668261509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668261563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10598 + ... + 38063.

It is an arithmetic number, because the mean of its divisors is an integer number (86423712).

Almost surely, 2^668261513 is an apocalyptic number.

It is an amenable number.

668261513 is a deficient number, since it is larger than the sum of its proper divisors (23128183).

668261513 is a wasteful number, since it uses less digits than its factorization.

668261513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49135.

The product of its digits is 51840, while the sum is 38.

The square root of 668261513 is about 25850.7545924679. The cubic root of 668261513 is about 874.2765232783.

The spelling of 668261513 in words is "six hundred sixty-eight million, two hundred sixty-one thousand, five hundred thirteen".