12118778532550 has 24 divisors (see below), whose sum is σ = 22549367453472. Its totient is φ = 4845696492000.

The previous prime is 12118778532493. The next prime is 12118778532559. The reversal of 12118778532550 is 5523587781121.

It is a junction number, because it is equal to n+sod(n) for n = 12118778532491 and 12118778532500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12118778532559) 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, 45238141 + ... + 45505240.

It is an arithmetic number, because the mean of its divisors is an integer number (939556977228).

Almost surely, 2^{12118778532550} is an apocalyptic number.

12118778532550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12118778532550 is a deficient number, since it is larger than the sum of its proper divisors (10430588920922).

12118778532550 is a wasteful number, since it uses less digits than its factorization.

12118778532550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90746064 (or 90746059 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 55.

The spelling of 12118778532550 in words is "twelve trillion, one hundred eighteen billion, seven hundred seventy-eight million, five hundred thirty-two thousand, five hundred fifty".