64623665212 has 12 divisors (see below), whose sum is σ = 113093582056. Its totient is φ = 32311213200.

The previous prime is 64623665159. The next prime is 64623665213. The reversal of 64623665212 is 21256632646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64623665213) 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, 143962 + ... + 387262.

Almost surely, 2^64623665212 is an apocalyptic number.

It is an amenable number.

64623665212 is a deficient number, since it is larger than the sum of its proper divisors (48469916844).

64623665212 is a wasteful number, since it uses less digits than its factorization.

64623665212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309708 (or 309706 counting only the distinct ones).

The product of its digits is 622080, while the sum is 43.

The spelling of 64623665212 in words is "sixty-four billion, six hundred twenty-three million, six hundred sixty-five thousand, two hundred twelve".