1065621427666 has 4 divisors (see below), whose sum is σ = 1598432141502. Its totient is φ = 532810713832.

The previous prime is 1065621427627. The next prime is 1065621427667. The reversal of 1065621427666 is 6667241265601.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 948537697041 + 117083730625 = 973929^2 + 342175^2 .

It is a super-2 number, since 2×1065621427666² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1065621427667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266405356915 + ... + 266405356918.

Almost surely, 2^{1065621427666} is an apocalyptic number.

1065621427666 is a deficient number, since it is larger than the sum of its proper divisors (532810713836).

1065621427666 is an equidigital number, since it uses as much as digits as its factorization.

1065621427666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532810713835.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 1065621427666 in words is "one trillion, sixty-five billion, six hundred twenty-one million, four hundred twenty-seven thousand, six hundred sixty-six".