211661502364 has 12 divisors (see below), whose sum is σ = 398900523784. Its totient is φ = 97689924144.

The previous prime is 211661502343. The next prime is 211661502397. The reversal of 211661502364 is 463205166112.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2035206702 + ... + 2035206805.

Almost surely, 2^211661502364 is an apocalyptic number.

It is an amenable number.

211661502364 is a deficient number, since it is larger than the sum of its proper divisors (187239021420).

211661502364 is a wasteful number, since it uses less digits than its factorization.

211661502364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070413524 (or 4070413522 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 211661502364 its reverse (463205166112), we get a palindrome (674866668476).

It can be divided in two parts, 211661 and 502364, that added together give a square (714025 = 845²).

The spelling of 211661502364 in words is "two hundred eleven billion, six hundred sixty-one million, five hundred two thousand, three hundred sixty-four".