13557790013578 has 4 divisors (see below), whose sum is σ = 20336685020370. Its totient is φ = 6778895006788.

The previous prime is 13557790013549. The next prime is 13557790013587. The reversal of 13557790013578 is 87531009775531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11516500598409 + 2041289415169 = 3393597^2 + 1428737^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389447503393 + ... + 3389447503396.

Almost surely, 2^{13557790013578} is an apocalyptic number.

13557790013578 is a deficient number, since it is larger than the sum of its proper divisors (6778895006792).

13557790013578 is an equidigital number, since it uses as much as digits as its factorization.

13557790013578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778895006791.

The product of its (nonzero) digits is 27783000, while the sum is 61.

The spelling of 13557790013578 in words is "thirteen trillion, five hundred fifty-seven billion, seven hundred ninety million, thirteen thousand, five hundred seventy-eight".