6502540020666 has 16 divisors (see below), whose sum is σ = 13453531077600. Its totient is φ = 2092771500848.

The previous prime is 6502540020583. The next prime is 6502540020679. The reversal of 6502540020666 is 6660200452056.

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, 18685459656 + ... + 18685460003.

It is an arithmetic number, because the mean of its divisors is an integer number (840845692350).

Almost surely, 2^{6502540020666} is an apocalyptic number.

6502540020666 is an abundant number, since it is smaller than the sum of its proper divisors (6950991056934).

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

6502540020666 is a wasteful number, since it uses less digits than its factorization.

6502540020666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37370919693.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 6502540020666 in words is "six trillion, five hundred two billion, five hundred forty million, twenty thousand, six hundred sixty-six".