64724121907 has 4 divisors (see below), whose sum is σ = 64725408216. Its totient is φ = 64722835600.

The previous prime is 64724121901. The next prime is 64724121929. The reversal of 64724121907 is 70912142746.

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 64724121907 - 2¹⁵ = 64724089139 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 564469 + ... + 669382.

It is an arithmetic number, because the mean of its divisors is an integer number (16181352054).

Almost surely, 2^64724121907 is an apocalyptic number.

64724121907 is a deficient number, since it is larger than the sum of its proper divisors (1286309).

64724121907 is a wasteful number, since it uses less digits than its factorization.

64724121907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286308.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 64724121907 in words is "sixty-four billion, seven hundred twenty-four million, one hundred twenty-one thousand, nine hundred seven".