1222666001 has 8 divisors (see below), whose sum is σ = 1230494664. Its totient is φ = 1214853120.

The previous prime is 1222665991. The next prime is 1222666019. The reversal of 1222666001 is 1006662221.

It can be written as a sum of positive squares in 4 ways, for example, as 23775376 + 1198890625 = 4876^2 + 34625^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222666001 is a prime.

It is a super-3 number, since 3×1222666001³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222666021) 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, 177461 + ... + 184221.

It is an arithmetic number, because the mean of its divisors is an integer number (153811833).

Almost surely, 2^1222666001 is an apocalyptic number.

It is an amenable number.

1222666001 is a deficient number, since it is larger than the sum of its proper divisors (7828663).

1222666001 is an equidigital number, since it uses as much as digits as its factorization.

1222666001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1222666001 is about 34966.6412599209. The cubic root of 1222666001 is about 1069.3074975823.

The spelling of 1222666001 in words is "one billion, two hundred twenty-two million, six hundred sixty-six thousand, one".