1256671263 has 32 divisors (see below), whose sum is σ = 1854945792. Its totient is φ = 752716800.

The previous prime is 1256671253. The next prime is 1256671291. The reversal of 1256671263 is 3621766521.

1256671263 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-1256671263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256671253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 950643 + ... + 951963.

It is an arithmetic number, because the mean of its divisors is an integer number (57967056).

Almost surely, 2^1256671263 is an apocalyptic number.

1256671263 is a deficient number, since it is larger than the sum of its proper divisors (598274529).

1256671263 is a wasteful number, since it uses less digits than its factorization.

1256671263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175.

The product of its digits is 90720, while the sum is 39.

The square root of 1256671263 is about 35449.5594189829. The cubic root of 1256671263 is about 1079.1303192447.

The spelling of 1256671263 in words is "one billion, two hundred fifty-six million, six hundred seventy-one thousand, two hundred sixty-three".