6918847621 has 8 divisors (see below), whose sum is σ = 8100114624. Its totient is φ = 5785795680.

The previous prime is 6918847513. The next prime is 6918847643. The reversal of 6918847621 is 1267488196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6918847621 - 2¹³ = 6918839429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6918847421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12053455 + ... + 12054028.

It is an arithmetic number, because the mean of its divisors is an integer number (1012514328).

Almost surely, 2^6918847621 is an apocalyptic number.

It is an amenable number.

6918847621 is a deficient number, since it is larger than the sum of its proper divisors (1181267003).

6918847621 is a wasteful number, since it uses less digits than its factorization.

6918847621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24107531.

The product of its digits is 1161216, while the sum is 52.

The square root of 6918847621 is about 83179.6106086101. The cubic root of 6918847621 is about 1905.5101010883.

The spelling of 6918847621 in words is "six billion, nine hundred eighteen million, eight hundred forty-seven thousand, six hundred twenty-one".