66664602642 has 32 divisors (see below), whose sum is σ = 145542852864. Its totient is φ = 20188504400.

The previous prime is 66664602619. The next prime is 66664602659. The reversal of 66664602642 is 24620646666.

It is a junction number, because it is equal to n+sod(n) for n = 66664602591 and 66664602600.

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, 217788 + ... + 425159.

It is an arithmetic number, because the mean of its divisors is an integer number (4548214152).

Almost surely, 2^66664602642 is an apocalyptic number.

66664602642 is an abundant number, since it is smaller than the sum of its proper divisors (78878250222).

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

66664602642 is a wasteful number, since it uses less digits than its factorization.

66664602642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644534.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 66664602642 in words is "sixty-six billion, six hundred sixty-four million, six hundred two thousand, six hundred forty-two".