1277742313791 has 12 divisors (see below), whose sum is σ = 1870910359968. Its totient is φ = 840159329184.

The previous prime is 1277742313787. The next prime is 1277742313831. The reversal of 1277742313791 is 1973132477721.

1277742313791 is a `hidden beast` number, since 1 + 277 + 74 + 231 + 3 + 79 + 1 = 666.

It is not a de Polignac number, because 1277742313791 - 2² = 1277742313787 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277742313391) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 972405975 + ... + 972407288.

It is an arithmetic number, because the mean of its divisors is an integer number (155909196664).

Almost surely, 2^{1277742313791} is an apocalyptic number.

1277742313791 is a deficient number, since it is larger than the sum of its proper divisors (593168046177).

1277742313791 is a wasteful number, since it uses less digits than its factorization.

1277742313791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944813342 (or 1944813339 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The spelling of 1277742313791 in words is "one trillion, two hundred seventy-seven billion, seven hundred forty-two million, three hundred thirteen thousand, seven hundred ninety-one".