1277753478464 has 28 divisors (see below), whose sum is σ = 2617333742208. Its totient is φ = 618267811200.

The previous prime is 1277753478437. The next prime is 1277753478479. The reversal of 1277753478464 is 4648743577721.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1277753478464.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322012502 + ... + 322016469.

Almost surely, 2^{1277753478464} is an apocalyptic number.

It is an amenable number.

1277753478464 is an abundant number, since it is smaller than the sum of its proper divisors (1339580263744).

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

1277753478464 is an equidigital number, since it uses as much as digits as its factorization.

1277753478464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644029014 (or 644029004 counting only the distinct ones).

The product of its digits is 221276160, while the sum is 65.

The spelling of 1277753478464 in words is "one trillion, two hundred seventy-seven billion, seven hundred fifty-three million, four hundred seventy-eight thousand, four hundred sixty-four".