1277880726016 has 80 divisors (see below), whose sum is σ = 2593468491768. Its totient is φ = 628953088000.

The previous prime is 1277880726011. The next prime is 1277880726037. The reversal of 1277880726016 is 6106270887721.

It can be written as a sum of positive squares in 4 ways, for example, as 1253719132416 + 24161593600 = 1119696^2 + 155440^2 .

It is not an unprimeable number, because it can be changed into a prime (1277880726011) 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, 8874756 + ... + 9017596.

Almost surely, 2^{1277880726016} is an apocalyptic number.

1277880726016 is a gapful number since it is divisible by the number (16) 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 1277880726016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1296734245884).

1277880726016 is an abundant number, since it is smaller than the sum of its proper divisors (1315587765752).

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

1277880726016 is a wasteful number, since it uses less digits than its factorization.

1277880726016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143133 (or 143117 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 55.

The spelling of 1277880726016 in words is "one trillion, two hundred seventy-seven billion, eight hundred eighty million, seven hundred twenty-six thousand, sixteen".