64724121909 has 24 divisors (see below), whose sum is σ = 94027033152. Its totient is φ = 42902449920.

The previous prime is 64724121901. The next prime is 64724121929. The reversal of 64724121909 is 90912142746.

64724121909 is a `hidden beast` number, since 6 + 47 + 2 + 412 + 190 + 9 = 666.

It is not a de Polignac number, because 64724121909 - 2³ = 64724121901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64724121901) 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, 1073064 + ... + 1131774.

It is an arithmetic number, because the mean of its divisors is an integer number (3917793048).

Almost surely, 2^64724121909 is an apocalyptic number.

It is an amenable number.

64724121909 is a deficient number, since it is larger than the sum of its proper divisors (29302911243).

64724121909 is a wasteful number, since it uses less digits than its factorization.

64724121909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59417 (or 59414 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 64724121909 in words is "sixty-four billion, seven hundred twenty-four million, one hundred twenty-one thousand, nine hundred nine".