1266628698916 has 81 divisors (see below), whose sum is σ = 2721990342267. Its totient is φ = 514148750640.

The previous prime is 1266628698901. The next prime is 1266628698917. The reversal of 1266628698916 is 6198968266621.

The square root of 1266628698916 is 1125446.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (1266628698917) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 299366521 + ... + 299370751.

Almost surely, 2^{1266628698916} is an apocalyptic number.

1266628698916 is the 1125446-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266628698916

1266628698916 is an abundant number, since it is smaller than the sum of its proper divisors (1455361643351).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266628698916 is an frugal number, since it uses more digits than its factorization.

1266628698916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518 (or 4259 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 70.

The spelling of 1266628698916 in words is "one trillion, two hundred sixty-six billion, six hundred twenty-eight million, six hundred ninety-eight thousand, nine hundred sixteen".