13555557780 has 24 divisors (see below), whose sum is σ = 37955561952. Its totient is φ = 3614815392.

The previous prime is 13555557751. The next prime is 13555557787. The reversal of 13555557780 is 8775555531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555557787) by changing a digit.

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, 112962922 + ... + 112963041.

It is an arithmetic number, because the mean of its divisors is an integer number (1581481748).

Almost surely, 2^13555557780 is an apocalyptic number.

13555557780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13555557780 is an abundant number, since it is smaller than the sum of its proper divisors (24400004172).

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

13555557780 is a wasteful number, since it uses less digits than its factorization.

13555557780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225925975 (or 225925973 counting only the distinct ones).

The product of its (nonzero) digits is 3675000, while the sum is 51.

The spelling of 13555557780 in words is "thirteen billion, five hundred fifty-five million, five hundred fifty-seven thousand, seven hundred eighty".