11389945680 has 80 divisors (see below), whose sum is σ = 39232042560. Its totient is φ = 3037318272.

The previous prime is 11389945661. The next prime is 11389945709. The reversal of 11389945680 is 8654998311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 2634402 + ... + 2638721.

It is an arithmetic number, because the mean of its divisors is an integer number (490400532).

Almost surely, 2^11389945680 is an apocalyptic number.

11389945680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11389945680 is an abundant number, since it is smaller than the sum of its proper divisors (27842096880).

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

11389945680 is a wasteful number, since it uses less digits than its factorization.

11389945680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5273145 (or 5273133 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

It can be divided in two parts, 11389945 and 680, that added together give a 6-th power (11390625 = 15⁶).

The spelling of 11389945680 in words is "eleven billion, three hundred eighty-nine million, nine hundred forty-five thousand, six hundred eighty".