1266216532061 has 8 divisors (see below), whose sum is σ = 1369470243960. Its totient is φ = 1163798883072.

The previous prime is 1266216532043. The next prime is 1266216532069. The reversal of 1266216532061 is 1602356126621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93349191961 + 1172867340100 = 305531^2 + 1082990^2 .

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 1266216532061 - 2¹⁸ = 1266216269917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266216532069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209012576 + ... + 209018633.

It is an arithmetic number, because the mean of its divisors is an integer number (171183780495).

Almost surely, 2^{1266216532061} is an apocalyptic number.

It is an amenable number.

1266216532061 is a deficient number, since it is larger than the sum of its proper divisors (103253711899).

1266216532061 is a wasteful number, since it uses less digits than its factorization.

1266216532061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418031455.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 1266216532061 in words is "one trillion, two hundred sixty-six billion, two hundred sixteen million, five hundred thirty-two thousand, sixty-one".