1565642255 has 8 divisors (see below), whose sum is σ = 1922463312. Its totient is φ = 1223385408.

The previous prime is 1565642249. The next prime is 1565642261. The reversal of 1565642255 is 5522465651.

It is an interprime number because it is at equal distance from previous prime (1565642249) and next prime (1565642261).

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 1565642255 - 2¹² = 1565638159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 3640814 + ... + 3641243.

It is an arithmetic number, because the mean of its divisors is an integer number (240307914).

Almost surely, 2^1565642255 is an apocalyptic number.

1565642255 is a deficient number, since it is larger than the sum of its proper divisors (356821057).

1565642255 is an equidigital number, since it uses as much as digits as its factorization.

1565642255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7282105.

The product of its digits is 360000, while the sum is 41.

The square root of 1565642255 is about 39568.1975202308. The cubic root of 1565642255 is about 1161.1745571803.

The spelling of 1565642255 in words is "one billion, five hundred sixty-five million, six hundred forty-two thousand, two hundred fifty-five".