1277318945421 has 24 divisors (see below), whose sum is σ = 1851526477944. Its totient is φ = 848544076800.

The previous prime is 1277318945417. The next prime is 1277318945437. The reversal of 1277318945421 is 1245498137721.

It is a happy number.

1277318945421 is a `hidden beast` number, since 1 + 2 + 7 + 7 + 3 + 1 + 8 + 94 + 542 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28760768100 + 1248558177321 = 169590^2 + 1117389^2 .

It is not a de Polignac number, because 1277318945421 - 2² = 1277318945417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277311945421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5345515 + ... + 5579351.

It is an arithmetic number, because the mean of its divisors is an integer number (77146936581).

Almost surely, 2^{1277318945421} is an apocalyptic number.

It is an amenable number.

1277318945421 is a deficient number, since it is larger than the sum of its proper divisors (574207532523).

1277318945421 is a wasteful number, since it uses less digits than its factorization.

1277318945421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235981 (or 235978 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 1277318945421 in words is "one trillion, two hundred seventy-seven billion, three hundred eighteen million, nine hundred forty-five thousand, four hundred twenty-one".