1277257480980 has 96 divisors (see below), whose sum is σ = 3855671025024. Its totient is φ = 314055028224.

The previous prime is 1277257480951. The next prime is 1277257480981. The reversal of 1277257480980 is 890847527721.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277257480981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195247 + ... + 1610166.

It is an arithmetic number, because the mean of its divisors is an integer number (40163239844).

Almost surely, 2^{1277257480980} is an apocalyptic number.

1277257480980 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 1277257480980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1927835512512).

1277257480980 is an abundant number, since it is smaller than the sum of its proper divisors (2578413544044).

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

1277257480980 is a wasteful number, since it uses less digits than its factorization.

1277257480980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806345 (or 1806343 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 60.

The spelling of 1277257480980 in words is "one trillion, two hundred seventy-seven billion, two hundred fifty-seven million, four hundred eighty thousand, nine hundred eighty".