1266453998128 has 30 divisors (see below), whose sum is σ = 2697102191252. Its totient is φ = 575660907360.

The previous prime is 1266453998113. The next prime is 1266453998137. The reversal of 1266453998128 is 8218993546621.

It is a self number, because there is not a number n which added to its sum of digits gives 1266453998128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 327078126 + ... + 327081997.

Almost surely, 2^{1266453998128} is an apocalyptic number.

It is an amenable number.

1266453998128 is an abundant number, since it is smaller than the sum of its proper divisors (1430648193124).

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

1266453998128 is a wasteful number, since it uses less digits than its factorization.

1266453998128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654160153 (or 654160136 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 64.

The spelling of 1266453998128 in words is "one trillion, two hundred sixty-six billion, four hundred fifty-three million, nine hundred ninety-eight thousand, one hundred twenty-eight".