13345557778 has 12 divisors (see below), whose sum is σ = 23286636702. Its totient is φ = 5719524720.

The previous prime is 13345557767. The next prime is 13345557809. The reversal of 13345557778 is 87775554331.

It can be written as a sum of positive squares in only one way, i.e., 12953398969 + 392158809 = 113813^2 + 19803^2 .

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68089483 + ... + 68089678.

Almost surely, 2^13345557778 is an apocalyptic number.

13345557778 is a deficient number, since it is larger than the sum of its proper divisors (9941078924).

13345557778 is a wasteful number, since it uses less digits than its factorization.

13345557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136179177 (or 136179170 counting only the distinct ones).

The product of its digits is 12348000, while the sum is 55.

The spelling of 13345557778 in words is "thirteen billion, three hundred forty-five million, five hundred fifty-seven thousand, seven hundred seventy-eight".