1277767140961 has 4 divisors (see below), whose sum is σ = 1312301388052. Its totient is φ = 1243232893872.

The previous prime is 1277767140941. The next prime is 1277767141039. The reversal of 1277767140961 is 1690417677721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 951405160000 + 326361980961 = 975400^2 + 571281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277767140961 - 2¹⁷ = 1277767009889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1277767140896 and 1277767140905.

It is not an unprimeable number, because it can be changed into a prime (1277767140941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17267123490 + ... + 17267123563.

It is an arithmetic number, because the mean of its divisors is an integer number (328075347013).

Almost surely, 2^{1277767140961} is an apocalyptic number.

It is an amenable number.

1277767140961 is a deficient number, since it is larger than the sum of its proper divisors (34534247091).

1277767140961 is an equidigital number, since it uses as much as digits as its factorization.

1277767140961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34534247090.

The product of its (nonzero) digits is 6223392, while the sum is 58.

The spelling of 1277767140961 in words is "one trillion, two hundred seventy-seven billion, seven hundred sixty-seven million, one hundred forty thousand, nine hundred sixty-one".