668867801 has 4 divisors (see below), whose sum is σ = 764420352. Its totient is φ = 573315252.

The previous prime is 668867779. The next prime is 668867813. The reversal of 668867801 is 108768866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668867801 - 2¹⁰ = 668866777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668867801.

It is not an unprimeable number, because it can be changed into a prime (668867821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47776265 + ... + 47776278.

It is an arithmetic number, because the mean of its divisors is an integer number (191105088).

Almost surely, 2^668867801 is an apocalyptic number.

It is an amenable number.

668867801 is a deficient number, since it is larger than the sum of its proper divisors (95552551).

668867801 is an equidigital number, since it uses as much as digits as its factorization.

668867801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95552550.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 668867801 is about 25862.4786321806. The cubic root of 668867801 is about 874.5408425272.

The spelling of 668867801 in words is "six hundred sixty-eight million, eight hundred sixty-seven thousand, eight hundred one".