66294394658 has 8 divisors (see below), whose sum is σ = 105291097452. Its totient is φ = 31197362176.

The previous prime is 66294394657. The next prime is 66294394669. The reversal of 66294394658 is 85649349266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64113784849 + 2180609809 = 253207^2 + 46697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66294394658.

It is not an unprimeable number, because it can be changed into a prime (66294394657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974917535 + ... + 974917602.

Almost surely, 2^66294394658 is an apocalyptic number.

66294394658 is a deficient number, since it is larger than the sum of its proper divisors (38996702794).

66294394658 is a wasteful number, since it uses less digits than its factorization.

66294394658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949835156.

The product of its digits is 67184640, while the sum is 62.

The spelling of 66294394658 in words is "sixty-six billion, two hundred ninety-four million, three hundred ninety-four thousand, six hundred fifty-eight".