1255507665 has 8 divisors (see below), whose sum is σ = 2008812288. Its totient is φ = 669604080.

The previous prime is 1255507633. The next prime is 1255507667. The reversal of 1255507665 is 5667055521.

It is a happy number.

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

It is not a de Polignac number, because 1255507665 - 2⁵ = 1255507633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255507667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41850241 + ... + 41850270.

It is an arithmetic number, because the mean of its divisors is an integer number (251101536).

Almost surely, 2^1255507665 is an apocalyptic number.

1255507665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1255507665 is a deficient number, since it is larger than the sum of its proper divisors (753304623).

1255507665 is an equidigital number, since it uses as much as digits as its factorization.

1255507665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83700519.

The product of its (nonzero) digits is 315000, while the sum is 42.

The square root of 1255507665 is about 35433.1435946629. The cubic root of 1255507665 is about 1078.7971476148.

The spelling of 1255507665 in words is "one billion, two hundred fifty-five million, five hundred seven thousand, six hundred sixty-five".