211861866634 has 16 divisors (see below), whose sum is σ = 346740945696. Its totient is φ = 96284767600.

The previous prime is 211861866617. The next prime is 211861866673. The reversal of 211861866634 is 436668168112.

211861866634 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668797 + ... + 933280.

It is an arithmetic number, because the mean of its divisors is an integer number (21671309106).

Almost surely, 2^211861866634 is an apocalyptic number.

211861866634 is a deficient number, since it is larger than the sum of its proper divisors (134879079062).

211861866634 is a wasteful number, since it uses less digits than its factorization.

211861866634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608101.

The product of its digits is 1990656, while the sum is 52.

The spelling of 211861866634 in words is "two hundred eleven billion, eight hundred sixty-one million, eight hundred sixty-six thousand, six hundred thirty-four".