5640161544 has 80 divisors (see below), whose sum is σ = 15815416320. Its totient is φ = 1877942880.

The previous prime is 5640161537. The next prime is 5640161557. The reversal of 5640161544 is 4451610465.

5640161544 is a `hidden beast` number, since 5 + 640 + 1 + 6 + 1 + 5 + 4 + 4 = 666.

It is a super-2 number, since 2×5640161544² = 63622844484832927872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5640161499 and 5640161508.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 637777 + ... + 646559.

It is an arithmetic number, because the mean of its divisors is an integer number (197692704).

Almost surely, 2^5640161544 is an apocalyptic number.

5640161544 is a gapful number since it is divisible by the number (54) 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 5640161544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7907708160).

5640161544 is an abundant number, since it is smaller than the sum of its proper divisors (10175254776).

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

5640161544 is a wasteful number, since it uses less digits than its factorization.

5640161544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9792 (or 9779 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 5640161544 is about 75101.0089412919. The cubic root of 5640161544 is about 1780.0430852678.

The spelling of 5640161544 in words is "five billion, six hundred forty million, one hundred sixty-one thousand, five hundred forty-four".