1277704920381 has 4 divisors (see below), whose sum is σ = 1703606560512. Its totient is φ = 851803280252.

The previous prime is 1277704920367. The next prime is 1277704920407. The reversal of 1277704920381 is 1830294077721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1277704920381 - 2²² = 1277700726077 is a prime.

It is a super-2 number, since 2×1277704920381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277704920181) 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, 212950820061 + ... + 212950820066.

It is an arithmetic number, because the mean of its divisors is an integer number (425901640128).

Almost surely, 2^{1277704920381} is an apocalyptic number.

It is an amenable number.

1277704920381 is a deficient number, since it is larger than the sum of its proper divisors (425901640131).

1277704920381 is an equidigital number, since it uses as much as digits as its factorization.

1277704920381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425901640130.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 1277704920381 in words is "one trillion, two hundred seventy-seven billion, seven hundred four million, nine hundred twenty thousand, three hundred eighty-one".