2661220615 has 8 divisors (see below), whose sum is σ = 3193922880. Its totient is φ = 2128671072.

The previous prime is 2661220571. The next prime is 2661220649. The reversal of 2661220615 is 5160221662.

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 2661220615 - 2⁷ = 2661220487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4497 + ... + 73093.

It is an arithmetic number, because the mean of its divisors is an integer number (399240360).

Almost surely, 2^2661220615 is an apocalyptic number.

2661220615 is a deficient number, since it is larger than the sum of its proper divisors (532702265).

2661220615 is an equidigital number, since it uses as much as digits as its factorization.

2661220615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76361.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2661220615 is about 51587.0198305737. The cubic root of 2661220615 is about 1385.7778849922. Note that the first 3 decimals are identical.

The spelling of 2661220615 in words is "two billion, six hundred sixty-one million, two hundred twenty thousand, six hundred fifteen".