133645426687 has 4 divisors (see below), whose sum is σ = 135640134616. Its totient is φ = 131650718760.

The previous prime is 133645426667. The next prime is 133645426703. The reversal of 133645426687 is 786624546331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 786624546331 = 13 ⋅60509580487.

It is a cyclic number.

It is not a de Polignac number, because 133645426687 - 2⁷ = 133645426559 is a prime.

It is a super-2 number, since 2×133645426687² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133645426667) 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, 997353864 + ... + 997353997.

It is an arithmetic number, because the mean of its divisors is an integer number (33910033654).

Almost surely, 2^133645426687 is an apocalyptic number.

133645426687 is a deficient number, since it is larger than the sum of its proper divisors (1994707929).

133645426687 is an equidigital number, since it uses as much as digits as its factorization.

133645426687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994707928.

The product of its digits is 17418240, while the sum is 55.

It can be divided in two parts, 13364 and 5426687, that added together give a triangular number (5440051 = T₃₂₉₈).

The spelling of 133645426687 in words is "one hundred thirty-three billion, six hundred forty-five million, four hundred twenty-six thousand, six hundred eighty-seven".