1266863987088 has 480 divisors, whose sum is σ = 4495646188800. Its totient is φ = 324831596544.

The previous prime is 1266863987027. The next prime is 1266863987101. The reversal of 1266863987088 is 8807893686621.

1266863987088 is a `hidden beast` number, since 12 + 6 + 6 + 86 + 398 + 70 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29415106 + ... + 29458142.

It is an arithmetic number, because the mean of its divisors is an integer number (9365929560).

Almost surely, 2^{1266863987088} is an apocalyptic number.

1266863987088 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266863987088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2247823094400).

1266863987088 is an abundant number, since it is smaller than the sum of its proper divisors (3228782201712).

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

1266863987088 is a wasteful number, since it uses less digits than its factorization.

1266863987088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43159 (or 43150 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 1266863987088 in words is "one trillion, two hundred sixty-six billion, eight hundred sixty-three million, nine hundred eighty-seven thousand, eighty-eight".