64640662042219 has 8 divisors (see below), whose sum is σ = 67452177284352. Its totient is φ = 61829234439720.

The previous prime is 64640662042211. The next prime is 64640662042241. The reversal of 64640662042219 is 91224026604646.

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 64640662042219 - 2³ = 64640662042211 is a prime.

It is a super-2 number, since 2×64640662042219² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64640662042211) 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, 20400469 + ... + 23355094.

It is an arithmetic number, because the mean of its divisors is an integer number (8431522160544).

Almost surely, 2^{64640662042219} is an apocalyptic number.

64640662042219 is a deficient number, since it is larger than the sum of its proper divisors (2811515242133).

64640662042219 is a wasteful number, since it uses less digits than its factorization.

64640662042219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43819817.

The product of its (nonzero) digits is 5971968, while the sum is 52.

The spelling of 64640662042219 in words is "sixty-four trillion, six hundred forty billion, six hundred sixty-two million, forty-two thousand, two hundred nineteen".