63218961667 has 4 divisors (see below), whose sum is σ = 66937724136. Its totient is φ = 59500199200.

The previous prime is 63218961653. The next prime is 63218961721. The reversal of 63218961667 is 76616981236.

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-63218961667 is a prime.

It is a super-2 number, since 2×63218961667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63218961607) 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, 1859381209 + ... + 1859381242.

It is an arithmetic number, because the mean of its divisors is an integer number (16734431034).

Almost surely, 2^63218961667 is an apocalyptic number.

63218961667 is a deficient number, since it is larger than the sum of its proper divisors (3718762469).

63218961667 is a wasteful number, since it uses less digits than its factorization.

63218961667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718762468.

The product of its digits is 3919104, while the sum is 55.

The spelling of 63218961667 in words is "sixty-three billion, two hundred eighteen million, nine hundred sixty-one thousand, six hundred sixty-seven".