64640435627 has 4 divisors (see below), whose sum is σ = 64664639136. Its totient is φ = 64616232120.

The previous prime is 64640435617. The next prime is 64640435663. The reversal of 64640435627 is 72653404646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64640435627 - 2⁴ = 64640435611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64640435617) 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, 12097748 + ... + 12103089.

It is an arithmetic number, because the mean of its divisors is an integer number (16166159784).

Almost surely, 2^64640435627 is an apocalyptic number.

64640435627 is a deficient number, since it is larger than the sum of its proper divisors (24203509).

64640435627 is a wasteful number, since it uses less digits than its factorization.

64640435627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24203508.

The product of its (nonzero) digits is 2903040, while the sum is 47.

The spelling of 64640435627 in words is "sixty-four billion, six hundred forty million, four hundred thirty-five thousand, six hundred twenty-seven".