211616666127 has 16 divisors (see below), whose sum is σ = 313520828160. Its totient is φ = 141071182200.

The previous prime is 211616666087. The next prime is 211616666143. The reversal of 211616666127 is 721666616112.

It is not a de Polignac number, because 211616666127 - 2¹⁵ = 211616633359 is a prime.

It is a super-2 number, since 2×211616666127² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211616666147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444102 + ... + 787692.

It is an arithmetic number, because the mean of its divisors is an integer number (19595051760).

Almost surely, 2^211616666127 is an apocalyptic number.

211616666127 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

211616666127 is a deficient number, since it is larger than the sum of its proper divisors (101904162033).

211616666127 is a wasteful number, since it uses less digits than its factorization.

211616666127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366411 (or 366405 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 211616666127 in words is "two hundred eleven billion, six hundred sixteen million, six hundred sixty-six thousand, one hundred twenty-seven".