6820912665 has 64 divisors (see below), whose sum is σ = 14336294400. Its totient is φ = 3010597632.

The previous prime is 6820912663. The next prime is 6820912673. The reversal of 6820912665 is 5662190286.

It is not a de Polignac number, because 6820912665 - 2¹ = 6820912663 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6820912665.

It is not an unprimeable number, because it can be changed into a prime (6820912663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97042 + ... + 151851.

It is an arithmetic number, because the mean of its divisors is an integer number (224004600).

Almost surely, 2^6820912665 is an apocalyptic number.

It is an amenable number.

6820912665 is an abundant number, since it is smaller than the sum of its proper divisors (7515381735).

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

6820912665 is a wasteful number, since it uses less digits than its factorization.

6820912665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248943 (or 248937 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6820912665 is about 82588.8168277037. The cubic root of 6820912665 is about 1896.4766341950.

The spelling of 6820912665 in words is "six billion, eight hundred twenty million, nine hundred twelve thousand, six hundred sixty-five".