66494785960 has 64 divisors (see below), whose sum is σ = 153078232320. Its totient is φ = 25984008960.

The previous prime is 66494785943. The next prime is 66494785961. The reversal of 66494785960 is 6958749466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66494785892 and 66494785901.

It is not an unprimeable number, because it can be changed into a prime (66494785961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 996030 + ... + 1060690.

It is an arithmetic number, because the mean of its divisors is an integer number (2391847380).

Almost surely, 2^66494785960 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 66494785960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76539116160).

66494785960 is an abundant number, since it is smaller than the sum of its proper divisors (86583446360).

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

66494785960 is a wasteful number, since it uses less digits than its factorization.

66494785960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65266 (or 65262 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 66494785960 in words is "sixty-six billion, four hundred ninety-four million, seven hundred eighty-five thousand, nine hundred sixty".