6685531440 has 160 divisors (see below), whose sum is σ = 24715846656. Its totient is φ = 1461672960.

The previous prime is 6685531429. The next prime is 6685531453. The reversal of 6685531440 is 441355866.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 6685531392 and 6685531401.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 47871 + ... + 125150.

Almost surely, 2^6685531440 is an apocalyptic number.

6685531440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6685531440 is an abundant number, since it is smaller than the sum of its proper divisors (18030315216).

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

6685531440 is a wasteful number, since it uses less digits than its factorization.

6685531440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173067 (or 173061 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 6685531440 is about 81765.0991560580. The cubic root of 6685531440 is about 1883.8456290499.

The spelling of 6685531440 in words is "six billion, six hundred eighty-five million, five hundred thirty-one thousand, four hundred forty".