1064665561 has 8 divisors (see below), whose sum is σ = 1129786560. Its totient is φ = 1001113872.

The previous prime is 1064665559. The next prime is 1064665571. The reversal of 1064665561 is 1655664601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1064665561 - 2¹ = 1064665559 is a prime.

It is a super-2 number, since 2×1064665561² = 2267025513558889442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1064665531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390930 + ... + 393643.

It is an arithmetic number, because the mean of its divisors is an integer number (141223320).

Almost surely, 2^1064665561 is an apocalyptic number.

It is an amenable number.

1064665561 is a deficient number, since it is larger than the sum of its proper divisors (65120999).

1064665561 is an equidigital number, since it uses as much as digits as its factorization.

1064665561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784655.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1064665561 is about 32629.2133064835. The cubic root of 1064665561 is about 1021.1065656520.

The spelling of 1064665561 in words is "one billion, sixty-four million, six hundred sixty-five thousand, five hundred sixty-one".