64669967517 has 8 divisors (see below), whose sum is σ = 86457795424. Its totient is φ = 42997725648.

The previous prime is 64669967513. The next prime is 64669967567. The reversal of 64669967517 is 71576996646.

It is a happy number.

64669967517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64669967517 - 2² = 64669967513 is a prime.

It is a super-3 number, since 3×64669967517³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64669967513) 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, 28895203 + ... + 28897440.

It is an arithmetic number, because the mean of its divisors is an integer number (10807224428).

Almost surely, 2^64669967517 is an apocalyptic number.

It is an amenable number.

64669967517 is a deficient number, since it is larger than the sum of its proper divisors (21787827907).

64669967517 is a wasteful number, since it uses less digits than its factorization.

64669967517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57793019.

The product of its digits is 102876480, while the sum is 66.

The spelling of 64669967517 in words is "sixty-four billion, six hundred sixty-nine million, nine hundred sixty-seven thousand, five hundred seventeen".