1138955664 has 160 divisors (see below), whose sum is σ = 3884322816. Its totient is φ = 278415360.

The previous prime is 1138955651. The next prime is 1138955737. The reversal of 1138955664 is 4665598311.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53769 + ... + 71895.

Almost surely, 2^1138955664 is an apocalyptic number.

1138955664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138955664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1942161408).

1138955664 is an abundant number, since it is smaller than the sum of its proper divisors (2745367152).

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

1138955664 is a wasteful number, since it uses less digits than its factorization.

1138955664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18173 (or 18167 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 1138955664 is about 33748.4172073299. The cubic root of 1138955664 is about 1044.3248354286.

The spelling of 1138955664 in words is "one billion, one hundred thirty-eight million, nine hundred fifty-five thousand, six hundred sixty-four".