13500420646 has 4 divisors (see below), whose sum is σ = 20250630972. Its totient is φ = 6750210322.

The previous prime is 13500420643. The next prime is 13500420691. The reversal of 13500420646 is 64602400531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64602400531 = 787 ⋅82086913.

It is a super-2 number, since 2×13500420646² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13500420643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375105160 + ... + 3375105163.

It is an arithmetic number, because the mean of its divisors is an integer number (5062657743).

Almost surely, 2^13500420646 is an apocalyptic number.

13500420646 is a deficient number, since it is larger than the sum of its proper divisors (6750210326).

13500420646 is an equidigital number, since it uses as much as digits as its factorization.

13500420646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750210325.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 13500420646 in words is "thirteen billion, five hundred million, four hundred twenty thousand, six hundred forty-six".