1266572165120 has 128 divisors (see below), whose sum is σ = 3044927015280. Its totient is φ = 505762283520.

The previous prime is 1266572165077. The next prime is 1266572165123. The reversal of 1266572165120 is 215612756621.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1266572165120² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266572165123) 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, 100427615 + ... + 100440225.

Almost surely, 2^{1266572165120} is an apocalyptic number.

1266572165120 is a gapful number since it is divisible by the number (10) 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 1266572165120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522463507640).

1266572165120 is an abundant number, since it is smaller than the sum of its proper divisors (1778354850160).

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

1266572165120 is an frugal number, since it uses more digits than its factorization.

1266572165120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13259 (or 13231 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 1266572165120 in words is "one trillion, two hundred sixty-six billion, five hundred seventy-two million, one hundred sixty-five thousand, one hundred twenty".