64642867522273 has 4 divisors (see below), whose sum is σ = 66389972049940. Its totient is φ = 62895762994608.

The previous prime is 64642867522267. The next prime is 64642867522291. The reversal of 64642867522273 is 37222576824646.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56168084844369 + 8474782677904 = 7494537^2 + 2911148^2 .

It is a cyclic number.

It is not a de Polignac number, because 64642867522273 - 2¹³ = 64642867514081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64642867522223) 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, 873552263778 + ... + 873552263851.

It is an arithmetic number, because the mean of its divisors is an integer number (16597493012485).

Almost surely, 2^{64642867522273} is an apocalyptic number.

It is an amenable number.

64642867522273 is a deficient number, since it is larger than the sum of its proper divisors (1747104527667).

64642867522273 is a wasteful number, since it uses less digits than its factorization.

64642867522273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747104527666.

The product of its digits is 325140480, while the sum is 64.

The spelling of 64642867522273 in words is "sixty-four trillion, six hundred forty-two billion, eight hundred sixty-seven million, five hundred twenty-two thousand, two hundred seventy-three".