64424446624661 has 4 divisors (see below), whose sum is σ = 64425579458892. Its totient is φ = 64423313790432.

The previous prime is 64424446624639. The next prime is 64424446624679. The reversal of 64424446624661 is 16642664442446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23348127360100 + 41076319264561 = 4831990^2 + 6409081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64424446624661 is a prime.

It is a super-3 number, since 3×64424446624661³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64424446624661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64424446624691) 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, 566331806 + ... + 566445551.

It is an arithmetic number, because the mean of its divisors is an integer number (16106394864723).

Almost surely, 2^{64424446624661} is an apocalyptic number.

It is an amenable number.

64424446624661 is a deficient number, since it is larger than the sum of its proper divisors (1132834231).

64424446624661 is a wasteful number, since it uses less digits than its factorization.

64424446624661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132834230.

The product of its digits is 127401984, while the sum is 59.

The spelling of 64424446624661 in words is "sixty-four trillion, four hundred twenty-four billion, four hundred forty-six million, six hundred twenty-four thousand, six hundred sixty-one".