66470644291820 has 48 divisors (see below), whose sum is σ = 139808066404608. Its totient is φ = 26546409888960.

The previous prime is 66470644291771. The next prime is 66470644291853. The reversal of 66470644291820 is 2819244607466.

It is a self number, because there is not a number n which added to its sum of digits gives 66470644291820.

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, 772772615 + ... + 772858625.

It is an arithmetic number, because the mean of its divisors is an integer number (2912668050096).

Almost surely, 2^{66470644291820} is an apocalyptic number.

It is an amenable number.

66470644291820 is an abundant number, since it is smaller than the sum of its proper divisors (73337422112788).

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

66470644291820 is a wasteful number, since it uses less digits than its factorization.

66470644291820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146390 (or 146388 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 59.

The spelling of 66470644291820 in words is "sixty-six trillion, four hundred seventy billion, six hundred forty-four million, two hundred ninety-one thousand, eight hundred twenty".