5640981871 has 36 divisors (see below), whose sum is σ = 7039829232. Its totient is φ = 4491306624.

The previous prime is 5640981869. The next prime is 5640981887. The reversal of 5640981871 is 1781890465.

It is not a de Polignac number, because 5640981871 - 2¹ = 5640981869 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5640981851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5738046 + ... + 5739028.

It is an arithmetic number, because the mean of its divisors is an integer number (195550812).

Almost surely, 2^5640981871 is an apocalyptic number.

5640981871 is a deficient number, since it is larger than the sum of its proper divisors (1398847361).

5640981871 is an equidigital number, since it uses as much as digits as its factorization.

5640981871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 49.

The square root of 5640981871 is about 75106.4702339286. The cubic root of 5640981871 is about 1780.1293798774.

The spelling of 5640981871 in words is "five billion, six hundred forty million, nine hundred eighty-one thousand, eight hundred seventy-one".