1066706401 has 4 divisors (see below), whose sum is σ = 1075105792. Its totient is φ = 1058307012.

The previous prime is 1066706359. The next prime is 1066706413. The reversal of 1066706401 is 1046076601.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1046076601 = 3719 ⋅281279.

It is a cyclic number.

It is not a de Polignac number, because 1066706401 - 2⁷ = 1066706273 is a prime.

It is a super-2 number, since 2×1066706401² = 2275725091868745602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066766401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4199505 + ... + 4199758.

It is an arithmetic number, because the mean of its divisors is an integer number (268776448).

Almost surely, 2^1066706401 is an apocalyptic number.

It is an amenable number.

1066706401 is a deficient number, since it is larger than the sum of its proper divisors (8399391).

1066706401 is an equidigital number, since it uses as much as digits as its factorization.

1066706401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8399390.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1066706401 is about 32660.4715367063. The cubic root of 1066706401 is about 1021.7585966982.

The spelling of 1066706401 in words is "one billion, sixty-six million, seven hundred six thousand, four hundred one".