13549780664 has 48 divisors (see below), whose sum is σ = 30572850600. Its totient is φ = 5606801088.

The previous prime is 13549780661. The next prime is 13549780679. The reversal of 13549780664 is 46608794531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13549780661) 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, 584594 + ... + 607329.

Almost surely, 2^13549780664 is an apocalyptic number.

13549780664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13549780664 is an abundant number, since it is smaller than the sum of its proper divisors (17023069936).

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

13549780664 is a wasteful number, since it uses less digits than its factorization.

13549780664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191972 (or 1191961 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 13549780664 in words is "thirteen billion, five hundred forty-nine million, seven hundred eighty thousand, six hundred sixty-four".