64818765290 has 8 divisors (see below), whose sum is σ = 116673777540. Its totient is φ = 25927506112.

The previous prime is 64818765289. The next prime is 64818765293. The reversal of 64818765290 is 9256781846.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64729027561 + 89737729 = 254419^2 + 9473^2 .

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

It is not an unprimeable number, because it can be changed into a prime (64818765293) 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, 3240938255 + ... + 3240938274.

Almost surely, 2^64818765290 is an apocalyptic number.

64818765290 is a deficient number, since it is larger than the sum of its proper divisors (51855012250).

64818765290 is a wasteful number, since it uses less digits than its factorization.

64818765290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6481876536.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 64818765290 in words is "sixty-four billion, eight hundred eighteen million, seven hundred sixty-five thousand, two hundred ninety".