6653666340 has 72 divisors (see below), whose sum is σ = 20728289400. Its totient is φ = 1726354944.

The previous prime is 6653666333. The next prime is 6653666347. The reversal of 6653666340 is 436663566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6653666333) and next prime (6653666347).

It can be written as a sum of positive squares in 4 ways, for example, as 1576248804 + 5077417536 = 39702^2 + 71256^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6653666347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 492865 + ... + 506184.

Almost surely, 2^6653666340 is an apocalyptic number.

6653666340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6653666340 is an abundant number, since it is smaller than the sum of its proper divisors (14074623060).

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

6653666340 is a wasteful number, since it uses less digits than its factorization.

6653666340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999101 (or 999096 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The square root of 6653666340 is about 81570.0088267741. The cubic root of 6653666340 is about 1880.8478841060.

The spelling of 6653666340 in words is "six billion, six hundred fifty-three million, six hundred sixty-six thousand, three hundred forty".