64693628109 has 24 divisors (see below), whose sum is σ = 101954035872. Its totient is φ = 39203428320.

The previous prime is 64693628081. The next prime is 64693628117. The reversal of 64693628109 is 90182639646.

64693628109 is a `hidden beast` number, since 6 + 4 + 6 + 9 + 3 + 628 + 1 + 0 + 9 = 666.

It is not a de Polignac number, because 64693628109 - 2⁷ = 64693627981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64693628009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 870862 + ... + 942224.

It is an arithmetic number, because the mean of its divisors is an integer number (4248084828).

Almost surely, 2^64693628109 is an apocalyptic number.

It is an amenable number.

64693628109 is a deficient number, since it is larger than the sum of its proper divisors (37260407763).

64693628109 is a wasteful number, since it uses less digits than its factorization.

64693628109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80537 (or 80534 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 64693628109 in words is "sixty-four billion, six hundred ninety-three million, six hundred twenty-eight thousand, one hundred nine".