1281772240000 has 160 divisors (see below), whose sum is σ = 3646735171200. Its totient is φ = 439464576000.

The previous prime is 1281772239983. The next prime is 1281772240019. The reversal of 1281772240000 is 422771821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 584440 + ... + 1704439.

It is an arithmetic number, because the mean of its divisors is an integer number (22792094820).

Almost surely, 2^{1281772240000} is an apocalyptic number.

1281772240000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281772240000 is an abundant number, since it is smaller than the sum of its proper divisors (2364962931200).

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

1281772240000 is an frugal number, since it uses more digits than its factorization.

1281772240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288920 (or 2288893 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The spelling of 1281772240000 in words is "one trillion, two hundred eighty-one billion, seven hundred seventy-two million, two hundred forty thousand".