36644430647 has 4 divisors (see below), whose sum is σ = 39975742536. Its totient is φ = 33313118760.

The previous prime is 36644430601. The next prime is 36644430673. The reversal of 36644430647 is 74603444663.

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: 74603444663 = 11 ⋅6782131333.

It is a cyclic number.

It is not a de Polignac number, because 36644430647 - 2¹⁴ = 36644414263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36644430677) 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, 1665655928 + ... + 1665655949.

It is an arithmetic number, because the mean of its divisors is an integer number (9993935634).

Almost surely, 2^36644430647 is an apocalyptic number.

36644430647 is a deficient number, since it is larger than the sum of its proper divisors (3331311889).

36644430647 is a wasteful number, since it uses less digits than its factorization.

36644430647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331311888.

The product of its (nonzero) digits is 3483648, while the sum is 47.

The spelling of 36644430647 in words is "thirty-six billion, six hundred forty-four million, four hundred thirty thousand, six hundred forty-seven".