64451021155643 has 4 divisors (see below), whose sum is σ = 66673470161040. Its totient is φ = 62228572150248.

The previous prime is 64451021155597. The next prime is 64451021155711. The reversal of 64451021155643 is 34655112015446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64451021155643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64451021175643) 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, 1111224502655 + ... + 1111224502712.

It is an arithmetic number, because the mean of its divisors is an integer number (16668367540260).

Almost surely, 2^{64451021155643} is an apocalyptic number.

64451021155643 is a deficient number, since it is larger than the sum of its proper divisors (2222449005397).

64451021155643 is a wasteful number, since it uses less digits than its factorization.

64451021155643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222449005396.

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 64451021155643 in words is "sixty-four trillion, four hundred fifty-one billion, twenty-one million, one hundred fifty-five thousand, six hundred forty-three".