666666700401 has 16 divisors (see below), whose sum is σ = 957300290240. Its totient is φ = 410241309120.

The previous prime is 666666700351. The next prime is 666666700409. The reversal of 666666700401 is 104007666666.

It is not a de Polignac number, because 666666700401 - 2¹⁵ = 666666667633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666666700409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807195 + ... + 1408863.

It is an arithmetic number, because the mean of its divisors is an integer number (59831268140).

Almost surely, 2^666666700401 is an apocalyptic number.

It is an amenable number.

666666700401 is a deficient number, since it is larger than the sum of its proper divisors (290633589839).

666666700401 is a wasteful number, since it uses less digits than its factorization.

666666700401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630096.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 666666700401 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred thousand, four hundred one".