13659397878 has 96 divisors (see below), whose sum is σ = 33065238528. Its totient is φ = 3746736000.

The previous prime is 13659397877. The next prime is 13659397883. The reversal of 13659397878 is 87879395631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13659397877) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1151578 + ... + 1163378.

It is an arithmetic number, because the mean of its divisors is an integer number (344429568).

Almost surely, 2^13659397878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13659397878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16532619264).

13659397878 is an abundant number, since it is smaller than the sum of its proper divisors (19405840650).

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

13659397878 is a wasteful number, since it uses less digits than its factorization.

13659397878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11978 (or 11971 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 66.

The spelling of 13659397878 in words is "thirteen billion, six hundred fifty-nine million, three hundred ninety-seven thousand, eight hundred seventy-eight".