1163644664 has 64 divisors (see below), whose sum is σ = 2826700800. Its totient is φ = 436109184.

The previous prime is 1163644637. The next prime is 1163644667. The reversal of 1163644664 is 4664463611.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163644667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28232 + ... + 55895.

It is an arithmetic number, because the mean of its divisors is an integer number (44167200).

Almost surely, 2^1163644664 is an apocalyptic number.

1163644664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1163644664 is an abundant number, since it is smaller than the sum of its proper divisors (1663056136).

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

1163644664 is a wasteful number, since it uses less digits than its factorization.

1163644664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84172 (or 84168 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 1163644664 is about 34112.2362796695. The cubic root of 1163644664 is about 1051.8168586335.

The spelling of 1163644664 in words is "one billion, one hundred sixty-three million, six hundred forty-four thousand, six hundred sixty-four".