64970668221 has 16 divisors (see below), whose sum is σ = 93674859264. Its totient is φ = 39898548224.

The previous prime is 64970668219. The next prime is 64970668223. The reversal of 64970668221 is 12286607946.

It is an interprime number because it is at equal distance from previous prime (64970668219) and next prime (64970668223).

It is a cyclic number.

It is not a de Polignac number, because 64970668221 - 2¹ = 64970668219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64970668223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13550100 + ... + 13554893.

It is an arithmetic number, because the mean of its divisors is an integer number (5854678704).

Almost surely, 2^64970668221 is an apocalyptic number.

It is an amenable number.

64970668221 is a deficient number, since it is larger than the sum of its proper divisors (28704191043).

64970668221 is a wasteful number, since it uses less digits than its factorization.

64970668221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27105060.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 64970668221 in words is "sixty-four billion, nine hundred seventy million, six hundred sixty-eight thousand, two hundred twenty-one".