66551428560 has 80 divisors (see below), whose sum is σ = 206484998400. Its totient is φ = 17731944960.

The previous prime is 66551428549. The next prime is 66551428571. The reversal of 66551428560 is 6582415566.

It is an interprime number because it is at equal distance from previous prime (66551428549) and next prime (66551428571).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166041 + ... + 400839.

It is an arithmetic number, because the mean of its divisors is an integer number (2581062480).

Almost surely, 2^66551428560 is an apocalyptic number.

66551428560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66551428560 is an abundant number, since it is smaller than the sum of its proper divisors (139933569840).

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

66551428560 is a wasteful number, since it uses less digits than its factorization.

66551428560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235996 (or 235990 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 66551428560 in words is "sixty-six billion, five hundred fifty-one million, four hundred twenty-eight thousand, five hundred sixty".