1256261564 has 12 divisors (see below), whose sum is σ = 2294043024. Its totient is φ = 600820704.

The previous prime is 1256261549. The next prime is 1256261581. The reversal of 1256261564 is 4651626521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6827417 + ... + 6827600.

It is an arithmetic number, because the mean of its divisors is an integer number (191170252).

Almost surely, 2^1256261564 is an apocalyptic number.

It is an amenable number.

1256261564 is a deficient number, since it is larger than the sum of its proper divisors (1037781460).

1256261564 is a wasteful number, since it uses less digits than its factorization.

1256261564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655044 (or 13655042 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 1256261564 is about 35443.7803288532. The cubic root of 1256261564 is about 1079.0130340855.

The spelling of 1256261564 in words is "one billion, two hundred fifty-six million, two hundred sixty-one thousand, five hundred sixty-four".