1291221037066 has 8 divisors (see below), whose sum is σ = 1984071349764. Its totient is φ = 629863920480.

The previous prime is 1291221037009. The next prime is 1291221037087. The reversal of 1291221037066 is 6607301221921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1262330896225 + 28890140841 = 1123535^2 + 169971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 7873298925 + ... + 7873299088.

Almost surely, 2^{1291221037066} is an apocalyptic number.

1291221037066 is a deficient number, since it is larger than the sum of its proper divisors (692850312698).

1291221037066 is a wasteful number, since it uses less digits than its factorization.

1291221037066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15746598056.

The product of its (nonzero) digits is 54432, while the sum is 40.

Adding to 1291221037066 its reverse (6607301221921), we get a palindrome (7898522258987).

The spelling of 1291221037066 in words is "one trillion, two hundred ninety-one billion, two hundred twenty-one million, thirty-seven thousand, sixty-six".