1261043568 has 60 divisors (see below), whose sum is σ = 3571724520. Its totient is φ = 415279488.

The previous prime is 1261043533. The next prime is 1261043573. The reversal of 1261043568 is 8653401621.

It is a happy number.

1261043568 is a `hidden beast` number, since 1 + 2 + 610 + 4 + 35 + 6 + 8 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 40803 + ... + 64706.

It is an arithmetic number, because the mean of its divisors is an integer number (59528742).

Almost surely, 2^1261043568 is an apocalyptic number.

1261043568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1261043568 is an abundant number, since it is smaller than the sum of its proper divisors (2310680952).

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

1261043568 is a wasteful number, since it uses less digits than its factorization.

1261043568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105606 (or 105597 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1261043568 is about 35511.1752551222. The cubic root of 1261043568 is about 1080.3804009777.

The spelling of 1261043568 in words is "one billion, two hundred sixty-one million, forty-three thousand, five hundred sixty-eight".