1276789551072 has 144 divisors (see below), whose sum is σ = 3957916749696. Its totient is φ = 353029190400.

The previous prime is 1276789551049. The next prime is 1276789551097. The reversal of 1276789551072 is 2701559876721.

It is a junction number, because it is equal to n+sod(n) for n = 1276789550997 and 1276789551015.

It is a congruent 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, 342754 + ... + 1634337.

It is an arithmetic number, because the mean of its divisors is an integer number (27485532984).

Almost surely, 2^{1276789551072} is an apocalyptic number.

1276789551072 is a gapful number since it is divisible by the number (12) 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 1276789551072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978958374848).

1276789551072 is an abundant number, since it is smaller than the sum of its proper divisors (2681127198624).

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

1276789551072 is a wasteful number, since it uses less digits than its factorization.

1276789551072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977173 (or 1977134 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 60.

The spelling of 1276789551072 in words is "one trillion, two hundred seventy-six billion, seven hundred eighty-nine million, five hundred fifty-one thousand, seventy-two".