13778458668 has 96 divisors (see below), whose sum is σ = 38945027520. Its totient is φ = 4239490752.

The previous prime is 13778458663. The next prime is 13778458693. The reversal of 13778458668 is 86685487731.

It is not an unprimeable number, because it can be changed into a prime (13778458663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53146 + ... + 174302.

It is an arithmetic number, because the mean of its divisors is an integer number (405677370).

Almost surely, 2^13778458668 is an apocalyptic number.

13778458668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13778458668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19472513760).

13778458668 is an abundant number, since it is smaller than the sum of its proper divisors (25166568852).

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

13778458668 is a wasteful number, since it uses less digits than its factorization.

13778458668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121195 (or 121175 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 63.

The spelling of 13778458668 in words is "thirteen billion, seven hundred seventy-eight million, four hundred fifty-eight thousand, six hundred sixty-eight".