1089321551640 has 384 divisors, whose sum is σ = 4069775923200. Its totient is φ = 247531576320.

The previous prime is 1089321551599. The next prime is 1089321551707. The reversal of 1089321551640 is 461551239801.

It is a happy number.

1089321551640 is a `hidden beast` number, since 1 + 0 + 8 + 9 + 32 + 1 + 551 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 494470779 + ... + 494472981.

It is an arithmetic number, because the mean of its divisors is an integer number (10598374800).

Almost surely, 2^{1089321551640} is an apocalyptic number.

1089321551640 is a gapful number since it is divisible by the number (10) 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 1089321551640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2034887961600).

1089321551640 is an abundant number, since it is smaller than the sum of its proper divisors (2980454371560).

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

1089321551640 is a wasteful number, since it uses less digits than its factorization.

1089321551640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3280 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

It can be divided in two parts, 1089321 and 551640, that added together give a square (1640961 = 1281²).

The spelling of 1089321551640 in words is "one trillion, eighty-nine billion, three hundred twenty-one million, five hundred fifty-one thousand, six hundred forty".