64506036643 has 8 divisors (see below), whose sum is σ = 65892106800. Its totient is φ = 63126224928.

The previous prime is 64506036599. The next prime is 64506036649. The reversal of 64506036643 is 34663060546.

It is a happy number.

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 64506036643 - 2²⁵ = 64472482211 is a prime.

It is a super-2 number, since 2×64506036643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64506036643.

It is not an unprimeable number, because it can be changed into a prime (64506036649) 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, 1543773 + ... + 1585006.

It is an arithmetic number, because the mean of its divisors is an integer number (8236513350).

Almost surely, 2^64506036643 is an apocalyptic number.

64506036643 is a deficient number, since it is larger than the sum of its proper divisors (1386070157).

64506036643 is a wasteful number, since it uses less digits than its factorization.

64506036643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129221.

The product of its (nonzero) digits is 933120, while the sum is 43.

The spelling of 64506036643 in words is "sixty-four billion, five hundred six million, thirty-six thousand, six hundred forty-three".