12217462640 has 20 divisors (see below), whose sum is σ = 28405600824. Its totient is φ = 4886985024.

The previous prime is 12217462637. The next prime is 12217462661. The reversal of 12217462640 is 4626471221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 12217462640.

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 3 ways as a sum of consecutive naturals, for example, 76359062 + ... + 76359221.

Almost surely, 2^12217462640 is an apocalyptic number.

12217462640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12217462640 is an abundant number, since it is smaller than the sum of its proper divisors (16188138184).

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

12217462640 is a wasteful number, since it uses less digits than its factorization.

12217462640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152718296 (or 152718290 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 12217462640 in words is "twelve billion, two hundred seventeen million, four hundred sixty-two thousand, six hundred forty".