64990044181653 has 4 divisors (see below), whose sum is σ = 86653392242208. Its totient is φ = 43326696121100.

The previous prime is 64990044181633. The next prime is 64990044181687. The reversal of 64990044181653 is 35618144009946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64990044181653 - 2²¹ = 64990042084501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64990044181633) 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, 10831674030273 + ... + 10831674030278.

It is an arithmetic number, because the mean of its divisors is an integer number (21663348060552).

Almost surely, 2^{64990044181653} is an apocalyptic number.

It is an amenable number.

64990044181653 is a deficient number, since it is larger than the sum of its proper divisors (21663348060555).

64990044181653 is a wasteful number, since it uses less digits than its factorization.

64990044181653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21663348060554.

The product of its (nonzero) digits is 22394880, while the sum is 60.

The spelling of 64990044181653 in words is "sixty-four trillion, nine hundred ninety billion, forty-four million, one hundred eighty-one thousand, six hundred fifty-three".