2620661009 has 8 divisors (see below), whose sum is σ = 2828900160. Its totient is φ = 2420280016.

The previous prime is 2620660979. The next prime is 2620661011. The reversal of 2620661009 is 9001660262.

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

It is a cyclic number.

It is not a de Polignac number, because 2620661009 - 2¹⁶ = 2620595473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2620661509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1963847 + ... + 1965180.

It is an arithmetic number, because the mean of its divisors is an integer number (353612520).

Almost surely, 2^2620661009 is an apocalyptic number.

2620661009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2620661009 is a deficient number, since it is larger than the sum of its proper divisors (208239151).

2620661009 is a wasteful number, since it uses less digits than its factorization.

2620661009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929079.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 2620661009 is about 51192.3921007800. The cubic root of 2620661009 is about 1378.7016088875.

The spelling of 2620661009 in words is "two billion, six hundred twenty million, six hundred sixty-one thousand, nine".