1256630155 has 16 divisors (see below), whose sum is σ = 1648512000. Its totient is φ = 911985760.

The previous prime is 1256630143. The next prime is 1256630239. The reversal of 1256630155 is 5510366521.

It is a de Polignac number, because none of the positive numbers 2^k-1256630155 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1256630155.

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 15 ways as a sum of consecutive naturals, for example, 2496 + ... + 50194.

It is an arithmetic number, because the mean of its divisors is an integer number (103032000).

Almost surely, 2^1256630155 is an apocalyptic number.

1256630155 is a deficient number, since it is larger than the sum of its proper divisors (391881845).

1256630155 is a wasteful number, since it uses less digits than its factorization.

1256630155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48194.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 1256630155 is about 35448.9796044964. The cubic root of 1256630155 is about 1079.1185523454.

Adding to 1256630155 its reverse (5510366521), we get a palindrome (6766996676).

The spelling of 1256630155 in words is "one billion, two hundred fifty-six million, six hundred thirty thousand, one hundred fifty-five".