6646362540 has 192 divisors, whose sum is σ = 19581004800. Its totient is φ = 1682795520.

The previous prime is 6646362539. The next prime is 6646362563. The reversal of 6646362540 is 452636466.

It is a junction number, because it is equal to n+sod(n) for n = 6646362492 and 6646362501.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23485239 + ... + 23485521.

It is an arithmetic number, because the mean of its divisors is an integer number (101984400).

Almost surely, 2^6646362540 is an apocalyptic number.

6646362540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6646362540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9790502400).

6646362540 is an abundant number, since it is smaller than the sum of its proper divisors (12934642260).

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

6646362540 is a wasteful number, since it uses less digits than its factorization.

6646362540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 42.

The square root of 6646362540 is about 81525.2264026295. The cubic root of 6646362540 is about 1880.1594232544.

The spelling of 6646362540 in words is "six billion, six hundred forty-six million, three hundred sixty-two thousand, five hundred forty".