13551549978 has 16 divisors (see below), whose sum is σ = 27206156736. Its totient is φ = 4500007200.

The previous prime is 13551549961. The next prime is 13551550013. The reversal of 13551549978 is 87994515531.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292323 + ... + 4295478.

It is an arithmetic number, because the mean of its divisors is an integer number (1700384796).

Almost surely, 2^13551549978 is an apocalyptic number.

13551549978 is an abundant number, since it is smaller than the sum of its proper divisors (13654606758).

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

13551549978 is a wasteful number, since it uses less digits than its factorization.

13551549978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588069.

The product of its digits is 6804000, while the sum is 57.

The spelling of 13551549978 in words is "thirteen billion, five hundred fifty-one million, five hundred forty-nine thousand, nine hundred seventy-eight".