666998890001 has 8 divisors (see below), whose sum is σ = 679607404200. Its totient is φ = 654391251072.

The previous prime is 666998889959. The next prime is 666998890007. The reversal of 666998890001 is 100098899666.

666998890001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 816700²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 349370837776 + 317628052225 = 591076^2 + 563585^2 .

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 666998890001 - 2³⁰ = 665925148177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666998890007) 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, 1436981 + ... + 1843613.

It is an arithmetic number, because the mean of its divisors is an integer number (84950925525).

Almost surely, 2^666998890001 is an apocalyptic number.

It is an amenable number.

666998890001 is a deficient number, since it is larger than the sum of its proper divisors (12608514199).

666998890001 is a wasteful number, since it uses less digits than its factorization.

666998890001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437635.

The product of its (nonzero) digits is 10077696, while the sum is 62.

The spelling of 666998890001 in words is "six hundred sixty-six billion, nine hundred ninety-eight million, eight hundred ninety thousand, one".