211407664969 has 4 divisors (see below), whose sum is σ = 212575663300. Its totient is φ = 210239666640.

The previous prime is 211407664957. The next prime is 211407664973. The reversal of 211407664969 is 969466704112.

211407664969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81346455369 + 130061209600 = 285213^2 + 360640^2 .

It is a cyclic number.

It is not a de Polignac number, because 211407664969 - 2¹³ = 211407656777 is a prime.

It is a super-2 number, since 2×211407664969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211407664999) 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 3 ways as a sum of consecutive naturals, for example, 583998894 + ... + 583999255.

It is an arithmetic number, because the mean of its divisors is an integer number (53143915825).

Almost surely, 2^211407664969 is an apocalyptic number.

It is an amenable number.

211407664969 is a deficient number, since it is larger than the sum of its proper divisors (1167998331).

211407664969 is a wasteful number, since it uses less digits than its factorization.

211407664969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167998330.

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

The spelling of 211407664969 in words is "two hundred eleven billion, four hundred seven million, six hundred sixty-four thousand, nine hundred sixty-nine".