2666647163520 has 1536 divisors, whose sum is σ = 10239486566400. Its totient is φ = 662171811840.

The previous prime is 2666647163497. The next prime is 2666647163563. The reversal of 2666647163520 is 253617466662.

It is a super-2 number, since 2×2666647163520² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 20997221697 + ... + 20997221823.

It is an arithmetic number, because the mean of its divisors is an integer number (6666332400).

Almost surely, 2^{2666647163520} is an apocalyptic number.

2666647163520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2666647163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5119743283200).

2666647163520 is an abundant number, since it is smaller than the sum of its proper divisors (7572839402880).

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

2666647163520 is a wasteful number, since it uses less digits than its factorization.

2666647163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 2666647163520 in words is "two trillion, six hundred sixty-six billion, six hundred forty-seven million, one hundred sixty-three thousand, five hundred twenty".