13213555778 has 8 divisors (see below), whose sum is σ = 19971634320. Its totient is φ = 6556344340.

The previous prime is 13213555777. The next prime is 13213555787. The reversal of 13213555778 is 87755531231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13213555777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25216448 + ... + 25216971.

It is an arithmetic number, because the mean of its divisors is an integer number (2496454290).

Almost surely, 2^13213555778 is an apocalyptic number.

13213555778 is a deficient number, since it is larger than the sum of its proper divisors (6758078542).

13213555778 is a wasteful number, since it uses less digits than its factorization.

13213555778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50433552.

The product of its digits is 882000, while the sum is 47.

The spelling of 13213555778 in words is "thirteen billion, two hundred thirteen million, five hundred fifty-five thousand, seven hundred seventy-eight".