1163641638 has 32 divisors (see below), whose sum is σ = 2404571904. Its totient is φ = 375125472.

The previous prime is 1163641627. The next prime is 1163641663. The reversal of 1163641638 is 8361463611.

It is a junction number, because it is equal to n+sod(n) for n = 1163641596 and 1163641605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21381 + ... + 52767.

It is an arithmetic number, because the mean of its divisors is an integer number (75142872).

Almost surely, 2^1163641638 is an apocalyptic number.

1163641638 is an abundant number, since it is smaller than the sum of its proper divisors (1240930266).

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

1163641638 is a wasteful number, since it uses less digits than its factorization.

1163641638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31596.

The product of its digits is 62208, while the sum is 39.

The square root of 1163641638 is about 34112.1919260548. The cubic root of 1163641638 is about 1051.8159469003.

The spelling of 1163641638 in words is "one billion, one hundred sixty-three million, six hundred forty-one thousand, six hundred thirty-eight".