1255639667 has 8 divisors (see below), whose sum is σ = 1326819840. Its totient is φ = 1185841800.

The previous prime is 1255639663. The next prime is 1255639673. The reversal of 1255639667 is 7669365521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1255639667 - 2² = 1255639663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255639663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343709 + ... + 347342.

It is an arithmetic number, because the mean of its divisors is an integer number (165852480).

Almost surely, 2^1255639667 is an apocalyptic number.

1255639667 is a deficient number, since it is larger than the sum of its proper divisors (71180173).

1255639667 is an equidigital number, since it uses as much as digits as its factorization.

1255639667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691153.

The product of its digits is 2041200, while the sum is 50.

The square root of 1255639667 is about 35435.0062367710. The cubic root of 1255639667 is about 1078.8349539394.

The spelling of 1255639667 in words is "one billion, two hundred fifty-five million, six hundred thirty-nine thousand, six hundred sixty-seven".