64885554618421 has 8 divisors (see below), whose sum is σ = 65341563363000. Its totient is φ = 64429819677120.

The previous prime is 64885554618419. The next prime is 64885554618427. The reversal of 64885554618421 is 12481645558846.

It can be written as a sum of positive squares in 4 ways, for example, as 5557264038225 + 59328290580196 = 2357385^2 + 7702486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64885554618421 - 2¹ = 64885554618419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64885554618427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67975186 + ... + 68923123.

It is an arithmetic number, because the mean of its divisors is an integer number (8167695420375).

Almost surely, 2^{64885554618421} is an apocalyptic number.

It is an amenable number.

64885554618421 is a deficient number, since it is larger than the sum of its proper divisors (456008744579).

64885554618421 is a wasteful number, since it uses less digits than its factorization.

64885554618421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136901639.

The product of its digits is 294912000, while the sum is 67.

The spelling of 64885554618421 in words is "sixty-four trillion, eight hundred eighty-five billion, five hundred fifty-four million, six hundred eighteen thousand, four hundred twenty-one".