12154212563 has 4 divisors (see below), whose sum is σ = 12546283968. Its totient is φ = 11762141160.

The previous prime is 12154212559. The next prime is 12154212571. The reversal of 12154212563 is 36521245121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36521245121 = 1601 ⋅22811521.

It is a cyclic number.

It is not a de Polignac number, because 12154212563 - 2² = 12154212559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12154212593) 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, 196035656 + ... + 196035717.

It is an arithmetic number, because the mean of its divisors is an integer number (3136570992).

Almost surely, 2^12154212563 is an apocalyptic number.

12154212563 is a deficient number, since it is larger than the sum of its proper divisors (392071405).

12154212563 is an equidigital number, since it uses as much as digits as its factorization.

12154212563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392071404.

The product of its digits is 14400, while the sum is 32.

Adding to 12154212563 its reverse (36521245121), we get a palindrome (48675457684).

The spelling of 12154212563 in words is "twelve billion, one hundred fifty-four million, two hundred twelve thousand, five hundred sixty-three".