1067649865 has 4 divisors (see below), whose sum is σ = 1281179844. Its totient is φ = 854119888.

The previous prime is 1067649859. The next prime is 1067649883. The reversal of 1067649865 is 5689467601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 603979776 + 463670089 = 24576^2 + 21533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1067649865 - 2⁹ = 1067649353 is a prime.

It is a super-2 number, since 2×1067649865² = 2279752468469036450, which contains 22 as substring.

It is a Duffinian 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, 106764982 + ... + 106764991.

It is an arithmetic number, because the mean of its divisors is an integer number (320294961).

Almost surely, 2^1067649865 is an apocalyptic number.

It is an amenable number.

1067649865 is a deficient number, since it is larger than the sum of its proper divisors (213529979).

1067649865 is an equidigital number, since it uses as much as digits as its factorization.

1067649865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213529978.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 1067649865 is about 32674.9118591007. The cubic root of 1067649865 is about 1022.0597443510.

The spelling of 1067649865 in words is "one billion, sixty-seven million, six hundred forty-nine thousand, eight hundred sixty-five".