1256763775 has 12 divisors (see below), whose sum is σ = 1596397824. Its totient is φ = 980888000.

The previous prime is 1256763737. The next prime is 1256763791. The reversal of 1256763775 is 5773676521.

It is a de Polignac number, because none of the positive numbers 2^k-1256763775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 612031 + ... + 614080.

It is an arithmetic number, because the mean of its divisors is an integer number (133033152).

Almost surely, 2^1256763775 is an apocalyptic number.

1256763775 is a deficient number, since it is larger than the sum of its proper divisors (339634049).

1256763775 is a wasteful number, since it uses less digits than its factorization.

1256763775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226162 (or 1226157 counting only the distinct ones).

The product of its digits is 1852200, while the sum is 49.

The square root of 1256763775 is about 35450.8642348815. The cubic root of 1256763775 is about 1079.1567992684.

The spelling of 1256763775 in words is "one billion, two hundred fifty-six million, seven hundred sixty-three thousand, seven hundred seventy-five".