1271255664 has 160 divisors (see below), whose sum is σ = 3835786240. Its totient is φ = 355332096.

The previous prime is 1271255663. The next prime is 1271255669. The reversal of 1271255664 is 4665521721.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271255663) 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, 3772104 + ... + 3772440.

It is an arithmetic number, because the mean of its divisors is an integer number (23973664).

Almost surely, 2^1271255664 is an apocalyptic number.

1271255664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271255664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1917893120).

1271255664 is an abundant number, since it is smaller than the sum of its proper divisors (2564530576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271255664 is a wasteful number, since it uses less digits than its factorization.

1271255664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 1271255664 is about 35654.6724006826. The cubic root of 1271255664 is about 1083.2889178687.

The spelling of 1271255664 in words is "one billion, two hundred seventy-one million, two hundred fifty-five thousand, six hundred sixty-four".