6686054640 has 120 divisors (see below), whose sum is σ = 22834721520. Its totient is φ = 1752717312.

The previous prime is 6686054587. The next prime is 6686054657. The reversal of 6686054640 is 464506866.

6686054640 is a `hidden beast` number, since 6 + 6 + 8 + 60 + 546 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 36217 + ... + 121176.

It is an arithmetic number, because the mean of its divisors is an integer number (190289346).

Almost surely, 2^6686054640 is an apocalyptic number.

6686054640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6686054640 is an abundant number, since it is smaller than the sum of its proper divisors (16148666880).

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

6686054640 is a wasteful number, since it uses less digits than its factorization.

6686054640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157471 (or 157462 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The square root of 6686054640 is about 81768.2985025370. The cubic root of 6686054640 is about 1883.8947701108.

The spelling of 6686054640 in words is "six billion, six hundred eighty-six million, fifty-four thousand, six hundred forty".