256105015 has 8 divisors (see below), whose sum is σ = 307416960. Its totient is φ = 204823392.

The previous prime is 256105013. The next prime is 256105037. The reversal of 256105015 is 510501652.

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 256105015 - 2¹ = 256105013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256105013) 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, 20401 + ... + 30469.

It is an arithmetic number, because the mean of its divisors is an integer number (38427120).

Almost surely, 2^256105015 is an apocalyptic number.

256105015 is a deficient number, since it is larger than the sum of its proper divisors (51311945).

256105015 is a wasteful number, since it uses less digits than its factorization.

256105015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 256105015 is about 16003.2813822666. The cubic root of 256105015 is about 635.0472323145.

Adding to 256105015 its reverse (510501652), we get a palindrome (766606667).

It can be divided in two parts, 25610 and 5015, that added together give a square (30625 = 175²).

The spelling of 256105015 in words is "two hundred fifty-six million, one hundred five thousand, fifteen".