218933946797 has 4 divisors (see below), whose sum is σ = 221059519200. Its totient is φ = 216808374396.

The previous prime is 218933946787. The next prime is 218933946823. The reversal of 218933946797 is 797649339812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218933946797 - 2¹⁶ = 218933881261 is a prime.

It is a super-2 number, since 2×218933946797² (a number of 23 digits) contains 22 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 (218933946787) 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, 1062786047 + ... + 1062786252.

It is an arithmetic number, because the mean of its divisors is an integer number (55264879800).

Almost surely, 2^218933946797 is an apocalyptic number.

It is an amenable number.

218933946797 is a deficient number, since it is larger than the sum of its proper divisors (2125572403).

218933946797 is a wasteful number, since it uses less digits than its factorization.

218933946797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125572402.

The product of its digits is 123451776, while the sum is 68.

The spelling of 218933946797 in words is "two hundred eighteen billion, nine hundred thirty-three million, nine hundred forty-six thousand, seven hundred ninety-seven".