211671661652 has 48 divisors (see below), whose sum is σ = 421734297600. Its totient is φ = 92017131360.

The previous prime is 211671661631. The next prime is 211671661681. The reversal of 211671661652 is 256166176112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9338549 + ... + 9361187.

It is an arithmetic number, because the mean of its divisors is an integer number (8786131200).

Almost surely, 2^211671661652 is an apocalyptic number.

211671661652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

211671661652 is a deficient number, since it is larger than the sum of its proper divisors (210062635948).

211671661652 is a wasteful number, since it uses less digits than its factorization.

211671661652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31916 (or 31914 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The spelling of 211671661652 in words is "two hundred eleven billion, six hundred seventy-one million, six hundred sixty-one thousand, six hundred fifty-two".