133781517717 has 4 divisors (see below), whose sum is σ = 178375356960. Its totient is φ = 89187678476.

The previous prime is 133781517703. The next prime is 133781517787. The reversal of 133781517717 is 717715187331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133781517717 - 2³¹ = 131634034069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133781517717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133781517787) 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, 22296919617 + ... + 22296919622.

It is an arithmetic number, because the mean of its divisors is an integer number (44593839240).

Almost surely, 2^133781517717 is an apocalyptic number.

It is an amenable number.

133781517717 is a deficient number, since it is larger than the sum of its proper divisors (44593839243).

133781517717 is an equidigital number, since it uses as much as digits as its factorization.

133781517717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44593839242.

The product of its digits is 864360, while the sum is 51.

The spelling of 133781517717 in words is "one hundred thirty-three billion, seven hundred eighty-one million, five hundred seventeen thousand, seven hundred seventeen".