1066421515 has 4 divisors (see below), whose sum is σ = 1279705824. Its totient is φ = 853137208.

The previous prime is 1066421497. The next prime is 1066421527. The reversal of 1066421515 is 5151246601.

1066421515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1066421515 - 2⁷ = 1066421387 is a prime.

It is a super-2 number, since 2×1066421515² = 2274509695309790450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106642147 + ... + 106642156.

It is an arithmetic number, because the mean of its divisors is an integer number (319926456).

Almost surely, 2^1066421515 is an apocalyptic number.

1066421515 is a deficient number, since it is larger than the sum of its proper divisors (213284309).

1066421515 is an equidigital number, since it uses as much as digits as its factorization.

1066421515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213284308.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1066421515 is about 32656.1099183598. The cubic root of 1066421515 is about 1021.6676280129.

The spelling of 1066421515 in words is "one billion, sixty-six million, four hundred twenty-one thousand, five hundred fifteen".