1066825421 has 2 divisors, whose sum is σ = 1066825422. Its totient is φ = 1066825420.

The previous prime is 1066825387. The next prime is 1066825451. The reversal of 1066825421 is 1245286601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1054300900 + 12524521 = 32470^2 + 3539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066825421 is a prime.

It is a super-2 number, since 2×1066825421² = 2276232957783654482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066825451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533412710 + 533412711.

It is an arithmetic number, because the mean of its divisors is an integer number (533412711).

Almost surely, 2^1066825421 is an apocalyptic number.

It is an amenable number.

1066825421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066825421 is an equidigital number, since it uses as much as digits as its factorization.

1066825421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1066825421 is about 32662.2935661291. The cubic root of 1066825421 is about 1021.7965969031.

The spelling of 1066825421 in words is "one billion, sixty-six million, eight hundred twenty-five thousand, four hundred twenty-one".