1066721407 has 8 divisors (see below), whose sum is σ = 1089325584. Its totient is φ = 1044209088.

The previous prime is 1066721329. The next prime is 1066721429. The reversal of 1066721407 is 7041276601.

It is a happy number.

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 1066721407 - 2²³ = 1058332799 is a prime.

It is a super-2 number, since 2×1066721407² = 2275789120304119298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066721497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763 + ... + 46195.

It is an arithmetic number, because the mean of its divisors is an integer number (136165698).

Almost surely, 2^1066721407 is an apocalyptic number.

1066721407 is a deficient number, since it is larger than the sum of its proper divisors (22604177).

1066721407 is an equidigital number, since it uses as much as digits as its factorization.

1066721407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45929.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1066721407 is about 32660.7012631389. The cubic root of 1066721407 is about 1021.7633879065.

The spelling of 1066721407 in words is "one billion, sixty-six million, seven hundred twenty-one thousand, four hundred seven".