64698667667 has 4 divisors (see below), whose sum is σ = 65023786800. Its totient is φ = 64373548536.

The previous prime is 64698667637. The next prime is 64698667679. The reversal of 64698667667 is 76676689646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64698667667 is a prime.

It is a super-2 number, since 2×64698667667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64698667667.

It is not an unprimeable number, because it can be changed into a prime (64698667637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162559268 + ... + 162559665.

It is an arithmetic number, because the mean of its divisors is an integer number (16255946700).

Almost surely, 2^64698667667 is an apocalyptic number.

64698667667 is a deficient number, since it is larger than the sum of its proper divisors (325119133).

64698667667 is a wasteful number, since it uses less digits than its factorization.

64698667667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325119132.

The product of its digits is 658409472, while the sum is 71.

The spelling of 64698667667 in words is "sixty-four billion, six hundred ninety-eight million, six hundred sixty-seven thousand, six hundred sixty-seven".