66581470788 has 96 divisors (see below), whose sum is σ = 186087573504. Its totient is φ = 18115899648.

The previous prime is 66581470777. The next prime is 66581470829. The reversal of 66581470788 is 88707418566.

It is a happy number.

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, 362656 + ... + 514472.

It is an arithmetic number, because the mean of its divisors is an integer number (1938412224).

Almost surely, 2^66581470788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66581470788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93043786752).

66581470788 is an abundant number, since it is smaller than the sum of its proper divisors (119506102716).

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

66581470788 is a wasteful number, since it uses less digits than its factorization.

66581470788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152081 (or 152079 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 60.

The spelling of 66581470788 in words is "sixty-six billion, five hundred eighty-one million, four hundred seventy thousand, seven hundred eighty-eight".