64491007533 has 8 divisors (see below), whose sum is σ = 86000412000. Its totient is φ = 42987804048.

The previous prime is 64491007519. The next prime is 64491007541. The reversal of 64491007533 is 33570019446.

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

It is not a de Polignac number, because 64491007533 - 2⁵ = 64491007501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64491007333) 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, 1525923 + ... + 1567616.

It is an arithmetic number, because the mean of its divisors is an integer number (10750051500).

Almost surely, 2^64491007533 is an apocalyptic number.

It is an amenable number.

64491007533 is a deficient number, since it is larger than the sum of its proper divisors (21509404467).

64491007533 is a wasteful number, since it uses less digits than its factorization.

64491007533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100491.

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 64491007533 in words is "sixty-four billion, four hundred ninety-one million, seven thousand, five hundred thirty-three".