6821478345616 has 45 divisors (see below), whose sum is σ = 14527597643643. Its totient is φ = 3100619739360.

The previous prime is 6821478345593. The next prime is 6821478345623. The reversal of 6821478345616 is 6165438741286.

The square root of 6821478345616 is 2611796.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 114889345 + ... + 114948703.

Almost surely, 2^{6821478345616} is an apocalyptic number.

6821478345616 is the 2611796-th square number.

It is an amenable number.

6821478345616 is an abundant number, since it is smaller than the sum of its proper divisors (7706119298027).

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

6821478345616 is an frugal number, since it uses more digits than its factorization.

6821478345616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118748 (or 59372 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 61.

The spelling of 6821478345616 in words is "six trillion, eight hundred twenty-one billion, four hundred seventy-eight million, three hundred forty-five thousand, six hundred sixteen".