133681815803 has 4 divisors (see below), whose sum is σ = 139494068688. Its totient is φ = 127869562920.

The previous prime is 133681815781. The next prime is 133681815833. The reversal of 133681815803 is 308518186331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308518186331 = 227 ⋅1359110953.

It is a cyclic number.

It is not a de Polignac number, because 133681815803 - 2²⁴ = 133665038587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133681815833) 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, 2906126408 + ... + 2906126453.

It is an arithmetic number, because the mean of its divisors is an integer number (34873517172).

Almost surely, 2^133681815803 is an apocalyptic number.

133681815803 is a deficient number, since it is larger than the sum of its proper divisors (5812252885).

133681815803 is an equidigital number, since it uses as much as digits as its factorization.

133681815803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812252884.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 133681815803 in words is "one hundred thirty-three billion, six hundred eighty-one million, eight hundred fifteen thousand, eight hundred three".