1263555011100 has 144 divisors (see below), whose sum is σ = 3686799029760. Its totient is φ = 334103078400.

The previous prime is 1263555011093. The next prime is 1263555011113. The reversal of 1263555011100 is 11105553621.

It is a super-2 number, since 2×1263555011100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50645229 + ... + 50670171.

It is an arithmetic number, because the mean of its divisors is an integer number (25602771040).

Almost surely, 2^{1263555011100} is an apocalyptic number.

1263555011100 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 1263555011100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1843399514880).

1263555011100 is an abundant number, since it is smaller than the sum of its proper divisors (2423244018660).

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

1263555011100 is a wasteful number, since it uses less digits than its factorization.

1263555011100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26380 (or 26373 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 1263555011100 in words is "one trillion, two hundred sixty-three billion, five hundred fifty-five million, eleven thousand, one hundred".