1266986920650 has 48 divisors (see below), whose sum is σ = 3427775527968. Its totient is φ = 307148344000.

The previous prime is 1266986920643. The next prime is 1266986920691. The reversal of 1266986920650 is 560296896621.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383933781 + ... + 383937080.

It is an arithmetic number, because the mean of its divisors is an integer number (71411990166).

Almost surely, 2^{1266986920650} is an apocalyptic number.

1266986920650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1266986920650 is an abundant number, since it is smaller than the sum of its proper divisors (2160788607318).

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

1266986920650 is a wasteful number, since it uses less digits than its factorization.

1266986920650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767870887 (or 767870882 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 60.

The spelling of 1266986920650 in words is "one trillion, two hundred sixty-six billion, nine hundred eighty-six million, nine hundred twenty thousand, six hundred fifty".