136321640447 has 4 divisors (see below), whose sum is σ = 136922176536. Its totient is φ = 135721104360.

The previous prime is 136321640437. The next prime is 136321640473. The reversal of 136321640447 is 744046123631.

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: 744046123631 = 20107 ⋅37004333.

It is a cyclic number.

It is not a de Polignac number, because 136321640447 - 2²⁰ = 136320591871 is a prime.

It is a super-2 number, since 2×136321640447² (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 (136321640407) 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, 300267704 + ... + 300268157.

It is an arithmetic number, because the mean of its divisors is an integer number (34230544134).

Almost surely, 2^136321640447 is an apocalyptic number.

136321640447 is a deficient number, since it is larger than the sum of its proper divisors (600536089).

136321640447 is an equidigital number, since it uses as much as digits as its factorization.

136321640447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600536088.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 136321640447 in words is "one hundred thirty-six billion, three hundred twenty-one million, six hundred forty thousand, four hundred forty-seven".