12555535401 has 24 divisors (see below), whose sum is σ = 18751299840. Its totient is φ = 8087148000.

The previous prime is 12555535357. The next prime is 12555535403. The reversal of 12555535401 is 10453555521.

12555535401 is a `hidden beast` number, since 1 + 2 + 55 + 553 + 54 + 0 + 1 = 666.

It is not a de Polignac number, because 12555535401 - 2⁹ = 12555534889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12555535403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136351 + ... + 209051.

It is an arithmetic number, because the mean of its divisors is an integer number (781304160).

Almost surely, 2^12555535401 is an apocalyptic number.

It is an amenable number.

12555535401 is a deficient number, since it is larger than the sum of its proper divisors (6195764439).

12555535401 is a wasteful number, since it uses less digits than its factorization.

12555535401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73357 (or 73354 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 12555535401 in words is "twelve billion, five hundred fifty-five million, five hundred thirty-five thousand, four hundred one".