6661772774340 has 96 divisors (see below), whose sum is σ = 19256358737280. Its totient is φ = 1719504101376.

The previous prime is 6661772774311. The next prime is 6661772774341. The reversal of 6661772774340 is 434772771666.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (6661772774341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7345630 + ... + 8202549.

It is an arithmetic number, because the mean of its divisors is an integer number (200587070180).

Almost surely, 2^{6661772774340} is an apocalyptic number.

6661772774340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6661772774340 is an abundant number, since it is smaller than the sum of its proper divisors (12594585962940).

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

6661772774340 is a wasteful number, since it uses less digits than its factorization.

6661772774340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15548421 (or 15548419 counting only the distinct ones).

The product of its (nonzero) digits is 49787136, while the sum is 60.

The spelling of 6661772774340 in words is "six trillion, six hundred sixty-one billion, seven hundred seventy-two million, seven hundred seventy-four thousand, three hundred forty".