12662534421 has 12 divisors (see below), whose sum is σ = 18345589600. Its totient is φ = 8416184040.

The previous prime is 12662534407. The next prime is 12662534429. The reversal of 12662534421 is 12443526621.

12662534421 is a `hidden beast` number, since 1 + 2 + 6 + 625 + 3 + 4 + 4 + 21 = 666.

It is not a de Polignac number, because 12662534421 - 2⁵ = 12662534389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12662534429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2122321 + ... + 2128278.

Almost surely, 2^12662534421 is an apocalyptic number.

It is an amenable number.

12662534421 is a deficient number, since it is larger than the sum of its proper divisors (5683055179).

12662534421 is a wasteful number, since it uses less digits than its factorization.

12662534421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250936 (or 4250933 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 12662534421 in words is "twelve billion, six hundred sixty-two million, five hundred thirty-four thousand, four hundred twenty-one".