1277081718427 has 4 divisors (see below), whose sum is σ = 1282658494720. Its totient is φ = 1271504942136.

The previous prime is 1277081718413. The next prime is 1277081718439. The reversal of 1277081718427 is 7248171807721.

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

It is a cyclic number.

It is not a de Polignac number, because 1277081718427 - 2³¹ = 1274934234779 is a prime.

It is a super-2 number, since 2×1277081718427² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1277081718127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2788387803 + ... + 2788388260.

It is an arithmetic number, because the mean of its divisors is an integer number (320664623680).

Almost surely, 2^{1277081718427} is an apocalyptic number.

1277081718427 is a deficient number, since it is larger than the sum of its proper divisors (5576776293).

1277081718427 is an equidigital number, since it uses as much as digits as its factorization.

1277081718427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5576776292.

The product of its (nonzero) digits is 2458624, while the sum is 55.

The spelling of 1277081718427 in words is "one trillion, two hundred seventy-seven billion, eighty-one million, seven hundred eighteen thousand, four hundred twenty-seven".