1266291904128 has 64 divisors (see below), whose sum is σ = 3364516405920. Its totient is φ = 421980779520.

The previous prime is 1266291904127. The next prime is 1266291904153. The reversal of 1266291904128 is 8214091926621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1266291904127) 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, 943263 + ... + 1849953.

Almost surely, 2^{1266291904128} is an apocalyptic number.

It is an amenable number.

1266291904128 is an abundant number, since it is smaller than the sum of its proper divisors (2098224501792).

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

1266291904128 is an equidigital number, since it uses as much as digits as its factorization.

1266291904128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910345 (or 910333 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 1266291904128 in words is "one trillion, two hundred sixty-six billion, two hundred ninety-one million, nine hundred four thousand, one hundred twenty-eight".