66434520880 has 80 divisors (see below), whose sum is σ = 190104957504. Its totient is φ = 21025428480.

The previous prime is 66434520869. The next prime is 66434520907. The reversal of 66434520880 is 8802543466.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66434520880.

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, 4555531 + ... + 4570090.

Almost surely, 2^66434520880 is an apocalyptic number.

It is an amenable number.

66434520880 is an abundant number, since it is smaller than the sum of its proper divisors (123670436624).

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

66434520880 is a wasteful number, since it uses less digits than its factorization.

66434520880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9125654 (or 9125648 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 66434520880 in words is "sixty-six billion, four hundred thirty-four million, five hundred twenty thousand, eight hundred eighty".