64409837961 has 12 divisors (see below), whose sum is σ = 99900973392. Its totient is φ = 36805621608.

The previous prime is 64409837959. The next prime is 64409837981. The reversal of 64409837961 is 16973890446.

It is not a de Polignac number, because 64409837961 - 2¹ = 64409837959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64409837981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219080935 + ... + 219081228.

It is an arithmetic number, because the mean of its divisors is an integer number (8325081116).

Almost surely, 2^64409837961 is an apocalyptic number.

It is an amenable number.

64409837961 is a deficient number, since it is larger than the sum of its proper divisors (35491135431).

64409837961 is a wasteful number, since it uses less digits than its factorization.

64409837961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438162180 (or 438162173 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 64409837961 in words is "sixty-four billion, four hundred nine million, eight hundred thirty-seven thousand, nine hundred sixty-one".