13961722878 has 12 divisors (see below), whose sum is σ = 30250399608. Its totient is φ = 4653907620.

The previous prime is 13961722871. The next prime is 13961722897. The reversal of 13961722878 is 87822716931.

It is a happy number.

13961722878 is a `hidden beast` number, since 1 + 396 + 172 + 2 + 87 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13961722871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 387825618 + ... + 387825653.

It is an arithmetic number, because the mean of its divisors is an integer number (2520866634).

Almost surely, 2^13961722878 is an apocalyptic number.

13961722878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13961722878 is an abundant number, since it is smaller than the sum of its proper divisors (16288676730).

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

13961722878 is a wasteful number, since it uses less digits than its factorization.

13961722878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775651279 (or 775651276 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 13961722878 in words is "thirteen billion, nine hundred sixty-one million, seven hundred twenty-two thousand, eight hundred seventy-eight".