6660566619 has 48 divisors (see below), whose sum is σ = 11151717120. Its totient is φ = 3514969920.

The previous prime is 6660566617. The next prime is 6660566621. The reversal of 6660566619 is 9166650666.

6660566619 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (6660566617) and next prime (6660566621).

It is not a de Polignac number, because 6660566619 - 2¹ = 6660566617 is a prime.

It is a super-2 number, since 2×6660566619² = 88726295372274182322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6660566617) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64084 + ... + 132014.

It is an arithmetic number, because the mean of its divisors is an integer number (232327440).

Almost surely, 2^6660566619 is an apocalyptic number.

6660566619 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

6660566619 is a deficient number, since it is larger than the sum of its proper divisors (4491150501).

6660566619 is a wasteful number, since it uses less digits than its factorization.

6660566619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68000 (or 67993 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 6660566619 is about 81612.2945333606. The cubic root of 6660566619 is about 1881.4978461273.

The spelling of 6660566619 in words is "six billion, six hundred sixty million, five hundred sixty-six thousand, six hundred nineteen".