12499895644078 has 4 divisors (see below), whose sum is σ = 18749843466120. Its totient is φ = 6249947822038.

The previous prime is 12499895644073. The next prime is 12499895644079. The reversal of 12499895644078 is 87044659899421.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×12499895644078² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12499895643995 and 12499895644013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12499895644073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3124973911018 + ... + 3124973911021.

It is an arithmetic number, because the mean of its divisors is an integer number (4687460866530).

Almost surely, 2^{12499895644078} is an apocalyptic number.

12499895644078 is a deficient number, since it is larger than the sum of its proper divisors (6249947822042).

12499895644078 is an equidigital number, since it uses as much as digits as its factorization.

12499895644078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249947822041.

The product of its (nonzero) digits is 1254113280, while the sum is 76.

The spelling of 12499895644078 in words is "twelve trillion, four hundred ninety-nine billion, eight hundred ninety-five million, six hundred forty-four thousand, seventy-eight".