6653894040 has 96 divisors (see below), whose sum is σ = 22426120080. Its totient is φ = 1774369152.

The previous prime is 6653894021. The next prime is 6653894047. The reversal of 6653894040 is 404983566.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6653894047) 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, 332559 + ... + 351998.

Almost surely, 2^6653894040 is an apocalyptic number.

6653894040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6653894040 is an abundant number, since it is smaller than the sum of its proper divisors (15772226040).

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

6653894040 is a wasteful number, since it uses less digits than its factorization.

6653894040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684583 (or 684567 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6653894040 is about 81571.4045484078. The cubic root of 6653894040 is about 1880.8693391533.

The spelling of 6653894040 in words is "six billion, six hundred fifty-three million, eight hundred ninety-four thousand, forty".