12678238658550 has 24 divisors (see below), whose sum is σ = 31442031873576. Its totient is φ = 3380863642240.

The previous prime is 12678238658537. The next prime is 12678238658573. The reversal of 12678238658550 is 5585683287621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42260795379 + ... + 42260795678.

It is an arithmetic number, because the mean of its divisors is an integer number (1310084661399).

Almost surely, 2^{12678238658550} is an apocalyptic number.

12678238658550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12678238658550 is an abundant number, since it is smaller than the sum of its proper divisors (18763793215026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12678238658550 is a wasteful number, since it uses less digits than its factorization.

12678238658550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84521591072 (or 84521591067 counting only the distinct ones).

The product of its (nonzero) digits is 193536000, while the sum is 66.

The spelling of 12678238658550 in words is "twelve trillion, six hundred seventy-eight billion, two hundred thirty-eight million, six hundred fifty-eight thousand, five hundred fifty".