1127521665 has 12 divisors (see below), whose sum is σ = 1954370964. Its totient is φ = 601344864.

The previous prime is 1127521649. The next prime is 1127521669. The reversal of 1127521665 is 5661257211.

1127521665 is a `hidden beast` number, since 1 + 127 + 521 + 6 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 392515344 + 735006321 = 19812^2 + 27111^2 .

It is not a de Polignac number, because 1127521665 - 2⁴ = 1127521649 is a prime.

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 not an unprimeable number, because it can be changed into a prime (1127521669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12527974 + ... + 12528063.

It is an arithmetic number, because the mean of its divisors is an integer number (162864247).

Almost surely, 2^1127521665 is an apocalyptic number.

1127521665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1127521665 is a deficient number, since it is larger than the sum of its proper divisors (826849299).

1127521665 is a wasteful number, since it uses less digits than its factorization.

1127521665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25056048 (or 25056045 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 1127521665 is about 33578.5893837129. The cubic root of 1127521665 is about 1040.8184093611.

Adding to 1127521665 its reverse (5661257211), we get a palindrome (6788778876).

The spelling of 1127521665 in words is "one billion, one hundred twenty-seven million, five hundred twenty-one thousand, six hundred sixty-five".