1255778011 has 2 divisors, whose sum is σ = 1255778012. Its totient is φ = 1255778010.

The previous prime is 1255778009. The next prime is 1255778021. The reversal of 1255778011 is 1108775521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255778011 - 2¹ = 1255778009 is a prime.

It is a super-2 number, since 2×1255778011² = 3153956825822232242, which contains 22 as substring.

Together with 1255778009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1255778021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627889005 + 627889006.

It is an arithmetic number, because the mean of its divisors is an integer number (627889006).

Almost surely, 2^1255778011 is an apocalyptic number.

1255778011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255778011 is an equidigital number, since it uses as much as digits as its factorization.

1255778011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19600, while the sum is 37.

The square root of 1255778011 is about 35436.9582639368. The cubic root of 1255778011 is about 1078.8745738149.

The spelling of 1255778011 in words is "one billion, two hundred fifty-five million, seven hundred seventy-eight thousand, eleven".