66212737656 has 32 divisors (see below), whose sum is σ = 178265063760. Its totient is φ = 20373149952.

The previous prime is 66212737609. The next prime is 66212737667. The reversal of 66212737656 is 65673721266.

It is a junction number, because it is equal to n+sod(n) for n = 66212737599 and 66212737608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106109845 + ... + 106110468.

Almost surely, 2^66212737656 is an apocalyptic number.

It is an amenable number.

66212737656 is an abundant number, since it is smaller than the sum of its proper divisors (112052326104).

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

66212737656 is a wasteful number, since it uses less digits than its factorization.

66212737656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212220335 (or 212220331 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 51.

The spelling of 66212737656 in words is "sixty-six billion, two hundred twelve million, seven hundred thirty-seven thousand, six hundred fifty-six".