1065664631 has 4 divisors (see below), whose sum is σ = 1080674064. Its totient is φ = 1050655200.

The previous prime is 1065664619. The next prime is 1065664637. The reversal of 1065664631 is 1364665601.

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

It is a cyclic number.

It is not a de Polignac number, because 1065664631 - 2¹⁸ = 1065402487 is a prime.

It is a super-2 number, since 2×1065664631² = 2271282211528732322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065664637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7504610 + ... + 7504751.

It is an arithmetic number, because the mean of its divisors is an integer number (270168516).

Almost surely, 2^1065664631 is an apocalyptic number.

1065664631 is a deficient number, since it is larger than the sum of its proper divisors (15009433).

1065664631 is an equidigital number, since it uses as much as digits as its factorization.

1065664631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15009432.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1065664631 is about 32644.5191571265. The cubic root of 1065664631 is about 1021.4258640430.

The spelling of 1065664631 in words is "one billion, sixty-five million, six hundred sixty-four thousand, six hundred thirty-one".