1277938523399 has 4 divisors (see below), whose sum is σ = 1298888335320. Its totient is φ = 1256988711480.

The previous prime is 1277938523353. The next prime is 1277938523401. The reversal of 1277938523399 is 9933258397721.

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 1277938523399 - 2¹² = 1277938519303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277958523399) 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, 10474905869 + ... + 10474905990.

It is an arithmetic number, because the mean of its divisors is an integer number (324722083830).

Almost surely, 2^{1277938523399} is an apocalyptic number.

1277938523399 is a deficient number, since it is larger than the sum of its proper divisors (20949811921).

1277938523399 is an equidigital number, since it uses as much as digits as its factorization.

1277938523399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20949811920.

The product of its digits is 154314720, while the sum is 68.

The spelling of 1277938523399 in words is "one trillion, two hundred seventy-seven billion, nine hundred thirty-eight million, five hundred twenty-three thousand, three hundred ninety-nine".