12521666264 has 8 divisors (see below), whose sum is σ = 23478124260. Its totient is φ = 6260833128.

The previous prime is 12521666191. The next prime is 12521666293. The reversal of 12521666264 is 46266612521.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 782604134 + ... + 782604149.

Almost surely, 2^12521666264 is an apocalyptic number.

It is an amenable number.

12521666264 is a deficient number, since it is larger than the sum of its proper divisors (10956457996).

12521666264 is a wasteful number, since it uses less digits than its factorization.

12521666264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565208289 (or 1565208285 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The spelling of 12521666264 in words is "twelve billion, five hundred twenty-one million, six hundred sixty-six thousand, two hundred sixty-four".