64065033621 has 10 divisors (see below), whose sum is σ = 95702087382. Its totient is φ = 42710022360.

The previous prime is 64065033619. The next prime is 64065033653. The reversal of 64065033621 is 12633056046.

64065033621 is a `hidden beast` number, since 640 + 6 + 5 + 0 + 3 + 3 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54423757521 + 9641276100 = 233289^2 + 98190^2 .

It is not a de Polignac number, because 64065033621 - 2¹ = 64065033619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64065033521) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 395463090 + ... + 395463251.

Almost surely, 2^64065033621 is an apocalyptic number.

It is an amenable number.

64065033621 is a deficient number, since it is larger than the sum of its proper divisors (31637053761).

64065033621 is an equidigital number, since it uses as much as digits as its factorization.

64065033621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790926353 (or 790926344 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 64065033621 its reverse (12633056046), we get a palindrome (76698089667).

The spelling of 64065033621 in words is "sixty-four billion, sixty-five million, thirty-three thousand, six hundred twenty-one".