1277161044720 has 160 divisors (see below), whose sum is σ = 4319906722560. Its totient is φ = 309558865920.

The previous prime is 1277161044623. The next prime is 1277161044739. The reversal of 1277161044720 is 274401617721.

It is a happy number.

It is a super-2 number, since 2×1277161044720² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15638232 + ... + 15719688.

It is an arithmetic number, because the mean of its divisors is an integer number (26999417016).

Almost surely, 2^{1277161044720} is an apocalyptic number.

1277161044720 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 1277161044720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2159953361280).

1277161044720 is an abundant number, since it is smaller than the sum of its proper divisors (3042745677840).

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

1277161044720 is a wasteful number, since it uses less digits than its factorization.

1277161044720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87423 (or 87417 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The spelling of 1277161044720 in words is "one trillion, two hundred seventy-seven billion, one hundred sixty-one million, forty-four thousand, seven hundred twenty".