66354709680 has 160 divisors (see below), whose sum is σ = 261205900800. Its totient is φ = 15166787328.

The previous prime is 66354709657. The next prime is 66354709693. The reversal of 66354709680 is 8690745366.

66354709680 is a `hidden beast` number, since 6 + 6 + 3 + 5 + 470 + 96 + 80 = 666.

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 31 ways as a sum of consecutive naturals, for example, 2179150 + ... + 2209389.

It is an arithmetic number, because the mean of its divisors is an integer number (1632536880).

Almost surely, 2^66354709680 is an apocalyptic number.

66354709680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66354709680 is an abundant number, since it is smaller than the sum of its proper divisors (194851191120).

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

66354709680 is a wasteful number, since it uses less digits than its factorization.

66354709680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388568 (or 4388556 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 66354709680 in words is "sixty-six billion, three hundred fifty-four million, seven hundred nine thousand, six hundred eighty".